JP7351727B2 - train call system - Google Patents

Description

The present invention relates to a train call system, and particularly to a train call system that uses a public wireless communication system such as LTE (Long Term Evolution) to enable calls between passengers and crew members and between a train cabin and a control room. related to useful techniques.

Current communication systems in railway vehicles include train radios that enable calls between crew members and ground-side command staff, telephones installed in each passenger cabin, and telephones installed in the driver's seat. There is an in-car communication system that allows calls between trains, but a communication system between train cabins and control rooms has not been implemented. Note that train radios include analog train radios and digital train radios. Additionally, there are train sets (trains) that are equipped with a train radio communication device, but do not have an in-car communication system.

International Publication WO2016/017036 Publication Japanese Patent Application Publication No. 2-294144

In recent years, trains equipped with self-driving functions have been put into practical use, and there are cases in which there are no crew members on board, but in such cases, passengers cannot communicate with the crew members even if an in-train communication system is installed. Can not. Therefore, in such a case, it is conceivable to construct a system that enables communication between the train cabin and the control room.
One possible method for enabling communication between the train cabin and the control room is to connect the in-car communication system to the train radio, for example. However, in the case of train sets (trains) that do not originally have an in-car communication system, it is necessary to construct a new in-car communication system and then connect it to the train radio, which poses the problem of large costs.

In addition, since there is a limit to the number of channels for train radio, when there are call requests from many trains at the same time, the dispatcher has to use multiple routes (lines) to communicate with multiple trains. is difficult to establish. Therefore, even if, for example, an accident or disaster occurs and there are call requests from passengers on multiple trains or multiple cars on the same train, a route (line) for the first call request will be established, and other call requests will be put on hold. The dispatcher is unable to recognize the situation and is unable to accurately judge the overall situation. Additionally, even if the train crew is using the train radio to talk to the dispatcher, there is a problem in that passengers on the train cannot talk to the crew or the dispatcher using the telephone in the cabin. .

Heretofore, there is an invention described in Patent Document 1, for example, as a technique for making it possible to contact the other party while the line is in use (congested). The invention described in Patent Document 1 is a communication system that transmits data to a safety information aggregation server when a mobile wireless communication line (first line) of a mobile phone restricts communication applications due to a disaster or the like. In controlling the terminal, it reads notification information regarding communication application restrictions (first line) and switches to data transmission using a wired line (second line) via an NFC (near field communication) reader or the like.
Furthermore, an invention has been proposed in which when a called party is absent when a call is made through a first line, the call can be made by switching to a second line (Patent Document 2).

If the invention of Patent Document 1 is applied to a train communication system and the cabin telephone is replaced with a mobile communication device, a significant increase in cost can be suppressed, but in the current railway system environment, the second NFC cannot be used as a line. It is also possible to use existing train radio instead of NFC as the second line, but even if that is done, the above-mentioned problem will arise when there are call requests from passengers on multiple trains or multiple cars. cannot be avoided.

Furthermore, by applying the invention of Patent Document 2 to a train telephone call system, when a passenger makes a call using a telephone in the cabin, if the crew member is on the phone or the crew member is absent, the It is conceivable to switch to the second line and call the command center, but if the train is running at high speed, it will be difficult to maintain a stable communication route.

The present invention has been made with a focus on the above-mentioned problems, and allows passengers to communicate with crew members without having to construct an in-train communication system that requires major modification work, even in train sets (trains) that do not have an in-train communication system. The purpose is to provide a train call system that allows communication with trains.
Another object of the present invention is to provide a train communication system that allows passengers to talk to a dispatcher when the crew is absent or busy.
Another object of the present invention is to provide a train call system that allows a dispatcher to understand the situation when there are calls requests from passengers on multiple trains or multiple cars on the same train. It is about providing.

In order to solve the above problems, the invention according to the present application:
An on-board system equipped with multiple cabin call terminals capable of wireless communication installed in each passenger cabin of a train, crew call terminals capable of wireless communication installed in the driver's seat, and a mobile station that performs wireless communication in a predetermined frequency band. ,
a train operation system that is equipped with an operation management device and a closed network and is capable of transmitting and receiving information to and from each running train through communication with the mobile station;
a public wireless communication network and an on-vehicle-to-ground communication network connected to the closed area network;
a call exchange server connected to the onboard-to-ground call network and having a storage means storing a list in which cabin call terminals and crew call terminals are grouped for each train;
In a train communication system equipped with
The cabin call terminal and the crew member call terminal are communication terminals capable of wireless communication via a public wireless communication network,
The train operation system is
a position information storage means for storing track location information of each train acquired by transmitting and receiving information with each running train;
External connection control means for controlling the connection between the closed network and the on-board-to-ground communication network,
The call exchange server includes:
associating means for storing the on-track position information of each train acquired from the position information storage means in a manner associated with cabin telephone call terminals and crew telephone call terminals in the list;
communication path establishment means for selecting and calling a corresponding crew member telephone terminal based on the information of the linking means when there is a call request from the cabin telephone terminal;
It is configured to have the following.

According to the train communication system configured as described above, the system allows passengers to communicate with crew members without major modification work, even in train formations (trains) that do not have an in-train communication system. can be constructed. Furthermore, since the call exchange server acquires the track position information of each train and stores it in association with the cabin call terminals and the crew call terminals, it is easy to maintain calls even when the train is running at high speed. Furthermore, since the in-vehicle communication system is constructed using a public wireless communication system (LTE, etc.), it is easy to add camera images from the passenger cabin and the driver's cab in the future, and the expandability of the system can be improved. can.

Preferably, the communication path establishing means is configured to establish a line connection between the passenger cabin telephone terminal and the commanding terminal when there is no response from the crew telephone terminal.
According to this configuration, passengers can talk to the dispatcher when the crew member is absent or when the crew member is on the phone.

Furthermore, preferably, the call exchange server is configured to be capable of transmitting information regarding the call requests from the plurality of guest room call terminals to a terminal in charge of commands when there are call requests from a plurality of different guest room call terminals. .
According to this configuration, when there are phone call requests from passengers on multiple trains or multiple cars on the same train, the dispatcher can grasp the situation.

Preferably, the train tracking server also includes a train tracking server that acquires and stores the location information of each train from the location information storage means via the onboard-to-ground communication network,
The linking means is configured to acquire track location information of each train from the train tracking server and store it in association with the cabin call terminals and crew call terminals in the list.
According to the above configuration, since it is equipped with a train tracking server that is connected to the onboard-to-ground communication network and acquires the location information of each train from the location information storage means of the train operation system, the burden on the call exchange server is reduced. can be reduced.

Furthermore, desirably, when there is an emergency request from a passenger on the train via the public wireless communication network, the call exchange server is configured to send information to the train based on the location information number of the train acquired from the train tracking server. The train is configured to search for the next station at which the train will stop, obtain communication connection information of a mobile terminal held by a station staff member at the station, and connect the passenger cabin communication terminal of the train to the mobile terminal to enable communication. do.
According to the above configuration, when there is an emergency call informing about the occurrence of a sudden illness, etc., the call exchange server can automatically make a call between the cabin call terminal of the train concerned and the mobile terminal of the station staff at the next stop station. Because the system is connected to the station, station staff who receive the report can quickly make arrangements to deal with the sudden illness.

According to the train communication system according to the present invention, even in train formations (trains) in which an in-train communication system has not been established, passengers can communicate with crew members without constructing an in-train communication system that requires major modification work. I can do it. Additionally, when the crew member is absent or busy on the phone, passengers can talk to the dispatcher. Furthermore, when there are call requests from passengers on multiple trains or multiple cars on the same train, the dispatcher can be aware of such a situation.

1 is a system configuration diagram showing an embodiment of a train communication system according to the present invention. 2 is a flowchart illustrating an example of a procedure for establishing a communication path by a call exchange server when a passenger uses a cabin call terminal to make a call request in the call system of the embodiment. FIG. 2 is a system configuration diagram showing a second embodiment of the train communication system according to the present invention. 12 is a flowchart showing an example of a procedure for establishing a communication path by a call exchange server when a passenger operates a call button for an emergency patient in a cabin in the call system of the second embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment will be described in which a train communication system according to the present invention is applied to a train (composition) capable of automatically operating, as an example, with reference to the drawings.
(First example)
FIG. 1 is a system configuration diagram showing the overall configuration of a train call system according to a first embodiment of the present invention, and FIG. 2 is a system configuration diagram showing a call request from a train cabin in a call exchange server configuring the train call system according to the first embodiment. 12 is a flowchart illustrating an example of a processing procedure when there is a problem.

As shown in FIG. 1, the train call system according to the present embodiment includes a plurality of call terminals (hereinafter referred to as cabin call terminals) 11A capable of wireless communication installed in each cabin of a train T, and a driver's seat. A car equipped with an installed telephone terminal capable of wireless communication (hereinafter referred to as a crew telephone terminal) 11B, an ATO on-board device 12 with an automatic operation control function mounted on the train T, a mobile station 13 for ATO communication, etc. A train operation system 20 comprising an ATO ground system 22 that communicates with the above-mentioned ATO onboard equipment 12 via a business closed network 21 and controls the running of each train; The telephone exchange system 30 is configured to enable telephone calls.

Although not shown, the onboard system 10 includes a speed generator that detects the rotational speed of the travel drive motor, and a predetermined inter-station travel pattern is stored in the storage device of the ATO onboard device 12. The ATO onboard device 12 compares the travel speed calculated based on the signal from the speed generator with the travel pattern, and controls the travel drive device (motor) and brake device to drive the train according to the travel pattern. It has an automatic driving function.
In addition, the ATO on-board device 12 calculates the traveling distance from the starting point based on the signal from the speed generator, and generates the train's on-track position information from the calculated traveling distance and the positional information of the starting point. It has a function of transmitting the information along with ID (identification information) to the ATO ground equipment 22, and the ATO ground equipment 22 grasps the position of each train in real time based on the received information.

The train operation system 20 is provided with an external connection server 23 for connecting with the business closed network 21 and the call switching system 30. In addition, the train operation system 20 sends information regarding the departure time and next station arrival time at each station, the next station arrival time, and the delay time from the scheduled time for each train number to the ATO ground equipment 22 via the business closed network 21. The operation management central device 24 has the function of transmitting the information on the actual schedule including train information, as well as grasping the positions of all trains within its jurisdiction in association with the train number based on the train location information and the information on the actual schedule, and displaying the information on the display device. Equipped with

Although not shown, the train operation system 20 is equipped with a station security system that grasps the location and course of trains and monitors whether they are traveling according to the timetable. track circuit equipment that detects the presence of trains in each predetermined section, controls the display of traffic signals based on the information from the track circuit equipment, and realizes overall safety functions by linking signals and switches. The onboard system 10 informs the on-board system 10 of the train's course and stop blocks (trailway) based on interlocking equipment for safely running the train, track location information from the track circuit equipment, and switch status information from the interlocking equipment. It is equipped with ATC ground equipment that transmits information such as (stop position of each circuit).

The call switching system 30 includes an existing public wireless communication network 31 such as a general-purpose mobile communication network such as LTE, and a vehicle-to-ground communication network 32 connected to the business closed area network 21 and the public wireless communication network 31. A call exchange server 33 connected to this network 32 is provided. Furthermore, a train tracking server 34 is connected to the on-board-to-ground communication network 32, which acquires position information of each running train from the operation management central device 24 in real time and grasps the position of each train. .

Each of the servers 23, 33, and 34 is composed of a microprocessor (MPU), a nonvolatile storage device such as a ROM that stores programs executed by the MPU, and a readable and writable storage device such as a RAM. and has a database.
Furthermore, a proxy server can be used for the external connection server 23 in order to restrict access to the business closed network. By using such a server, devices and servers connected from the public wireless communication network 31 to the commercial closed network 21 can be connected to the commercial closed network 21 and the on-vehicle-to-ground communication network 32. It is possible to prevent unauthorized access to.

In this embodiment, a plurality of cabin call terminals 11A, crew member call terminals 11B, and ATO communication mobile stations 13 constituting the on-board system 10 are grouped for each train (composition), and the call exchange server 33 The database stores terminal address (calling number) lists and mobile station IDs grouped by train.
When the call exchange server 33 receives a call request from the cabin call terminal 11A, it refers to the database and determines the train group to which the cabin call terminal 11A belongs and the address (calling number) of the crew call terminal 11B in that group. At the same time as searching, a process is executed to acquire the location information of the train from the train tracking server 34 and connect the line. Further, when the crew member telephone terminal 11B is in the middle of a telephone call, the cabin telephone terminal 11A which is the source of the request is configured to connect the line to the terminal 36 in charge of commands.

In the above embodiment, the ground side device (ATO ground device 22) and the onboard device (ATO onboard device 12) of the train operation system 20 perform automatic train operation control while exchanging information via wireless communication. Although the case has been described in which the present invention is applied to a support system, the present invention is not limited thereto, and may be a system having a function of transmitting train location information from the onboard side to the ground side using digital radio etc. .
In the above embodiment, the on-board device (ATO on-board device 12) calculates the train's track position based on the signal from the speed generator installed on the axle, and 22), but the train is equipped with a GPS device that receives GPS (Global Positioning System) signals, and the location information acquired by this GPS device is sent to the ground side device. It may be configured as follows.

Next, the procedure for establishing a communication path by the call exchange server 33 when a passenger makes a call request using the cabin call terminal 11A will be explained using the flowchart of FIG.
When the call exchange server 33 is started with the external connection server 23 and the train tracking server 34 being started, the call exchange server 33 sends the train tracking server 34 the IDs of all the trains to be controlled and those on the train. The train tracking server 34 requests location information (step S1), and in response to the request, the train tracking server 34 transmits all train IDs and track location information, which the call exchange server 33 receives (step S2).

Upon receiving the response from the train tracking server 34, the call exchange server 33 performs a process of linking the communication terminal group of each train stored in the database with the received train ID and track location (step S3). The above process is repeatedly executed during server startup. Although not shown in FIG. 2, the process of the train tracking server 34 acquiring track position information of each train from the ATO ground equipment 22 via the external connection server 23 of the train operation system 20 is also repeatedly executed. .

Thereafter, when the call exchange server 33 receives a call request from the cabin call terminal 11A of any train, the call exchange server 33 searches the list in the database for the terminal group to which the cabin call terminal 11A belongs. , acquires the address (calling number) of the crew member telephone terminal 11B belonging to the group (step S4). Further, the call exchange server 33 acquires from the database the location information of the train that is linked to the terminal group that made the call request (step S5).

Subsequently, the call exchange server 33 calls the crew member call terminal 11B of the corresponding group using the terminal address acquired in step S4 (step S6). If it is determined that there is a call response from the crew member call terminal 11B (step S7: Yes), the crew member call terminal 11B is connected to the cabin call terminal 11A that made the call request, and a call session is established (step S8). Thereafter, upon receiving a call termination request from the crew call terminal 11B, the line is cut off (step S9).

On the other hand, if it is determined that the time has elapsed for the call in step S6, that is, there is no response even after a predetermined period of time has elapsed (step S7: No), the process moves to step S10, and the call exchange server 33 sends the command to the terminal 36. When there is a response, a line connection is made between the requesting guest room telephone terminal 11A and the commanding terminal 36, and a process is executed to establish a telephone conversation session (step S11).
By executing the above process, it is possible to establish a call session between the passenger cabin call terminal 11A and the crew member call terminal 11B of the train using the public wireless communication system (LTE), and to hold the crew member call for a certain period of time. If there is no response from the terminal 11B, a call session can be established between the guest room call terminal 11A and the terminal 36 in charge of command.

In addition, when a call request is received from a cabin call terminal in another car on the same train or a cabin call terminal in another train during a call between a cabin call terminal 11A and a crew call terminal 11B, the call exchange server 33 For example, by push notification of that information to the terminal 36 of the dispatcher and displaying it on the display device, the dispatcher can easily understand that such a situation is occurring. can do.
Note that before determining in step S7 whether or not there is a response to the call from the crew member call terminal 11B, the call exchange server 33 determines whether or not a crew member is on board the train, and if no crew member is on board the train, , the line connection between the guest room telephone terminal 11A and the terminal 36 in charge of command may be established immediately.

Furthermore, it is known from experience that the majority of phone calls from train passengers are to inform of the occurrence of sudden illness, so in this example, in the event of such an emergency call, The call exchange server 33 is configured to automatically respond.
Specifically, when there is a call request from a train passenger using the cabin call terminal 11A, the call exchange server 33 first determines whether or not the train crew member is absent or is already on a call. When the crew member is not present or on the phone, the cabin call terminal 11A is connected to the crew member call terminal 11B. When the train crew receives notification from a passenger that a sudden illness has occurred, they can call the next station and request that arrangements be made to deal with the sudden illness.

On the other hand, when the call exchange server 33 receives a call request from a passenger and determines that the train crew member is absent or is already on a call, the call exchange server 33 connects the cabin call terminal 11A to the terminal 36 in charge of command. At the same time, for example, a response request button is displayed on the display device of the dispatcher's terminal 36 to request response to a sudden illness, and the next station to stop is searched based on the train's current position and train schedule information, and an e-mail address list is displayed. The e-mail address of the terminal at the next stop station or the mobile terminal owned by a station staff member at the station is obtained from.

Then, when the dispatcher understands that there is a sudden illness and operates the response request button displayed on the dispatcher's terminal 36, and the call exchange server 33 recognizes this, the e-mail address obtained Automatically sends an email containing a request for emergency medical care (including train number and car number information) to
By executing the process described above, when a crew member is absent and there is an emergency call to notify of the occurrence of a sudden illness, the call exchange server 33 automatically sends an email to the next stop of the train to notify the train of the sudden illness. It is possible to notify the staff of the occurrence of a sick person and make arrangements to deal with the sudden illness, such as dispatching staff to the station platform.

(Second example)
FIG. 3 shows a system configuration diagram of a second embodiment of the train communication system according to the present invention.
The difference from the telephone call system of the first embodiment shown in FIG. A call button 14 is installed, and when the emergency call button 14 is operated, an emergency message is sent to the call exchange server 33 via the public wireless communication network 31, and the call exchange server 33 calls the corresponding guest room. Search for the telephone number of the mobile terminal 37 held by the telephone terminal 11A and a station staff such as a station staff or security guard at the station where the train will next stop, and then use the telephone number of the mobile terminal 37 held by the telephone terminal 11A and the station staff at the next station where the train stops. It is configured so that a communication path can be established with the terminal 37 and a telephone conversation can be made. As a result, in the event that there is an emergency call from a train passenger informing us of the occurrence of a sudden illness, the train's next station will be able to promptly make arrangements to deal with the sudden illness, such as dispatching staff to the station platform. can.

In addition, instead of providing the emergency call button 14, a guide board with operating instructions may be provided next to the cabin telephone terminal 11A, or when a passenger picks up the cabin telephone terminal 11A, automatic voice guidance will be played and the passenger will follow the guidance to call the cabin telephone terminal 11A. When the content of the inquiry is selected by operating , the call exchange server 33 may be configured to establish a communication path with the call terminal of the corresponding department and make a call. Further, the configuration may be such that information on the content of the operation according to the guidance is transmitted to the terminal 36 in charge of commands. By adopting such a configuration, the dispatcher can accurately judge the overall situation when there are multiple call requests. Furthermore, when there are multiple call requests at the same time, the call exchange server 33 can be configured to determine the priority order and respond to the call requests in descending order of priority.

FIG. 4 shows a procedure for establishing a communication path by the call exchange server 33 when a train passenger operates the emergency call button 14 to make a request in the call system of the second embodiment. There is.
When the system is started, the call exchange server 33 requests the train tracking server 34 for information on the IDs and track positions of all trains to be controlled (step S21), and the train tracking server 34 responds to the request. information on the IDs and train positions of all trains is transmitted, and the call exchange server 33 receives the information (step S22).

Upon receiving the response from the train tracking server 34, the call exchange server 33 performs a process of linking the communication terminal group of each train stored in the database with the received train ID and track location (step S23). The processing up to this point is the same as the processing (steps S1 to S3) by the call exchange server 33 in the first embodiment shown in FIG.
Thereafter, when the emergency call button 14 provided in the cabin of any train is operated and the call exchange server 33 receives an emergency request, the call exchange server 33 selects the terminal group to which the operated emergency call button 14 belongs. The location information of the train linked to is acquired from the database (step S24).

Subsequently, the call exchange server 33 notifies the terminal 36 in charge of the command of an alarm indicating that an emergency request has been made (step S25), and based on the train location and train schedule information acquired in step S24, The next station to stop is specified, the calling number of the mobile terminal 37 held by the station staff at the next station is searched from the database, and a call is made to the crew member calling terminal 11B of the corresponding group (step S26). If it is determined that there is a call response from the station staff terminal 37 (step S27: Yes), a line connection is established between the station staff terminal 37 and the guest room telephone terminal 11A adjacent to the operated emergency call button 14, and a call is made. A session is constructed (step S28). Thereafter, upon receiving a call termination request from the station staff terminal 37, the line is cut off (step S29).

On the other hand, if it is determined that the time has elapsed for the call in step S26, that is, there is no response even after a predetermined period of time has elapsed (step S27: No), the process moves to step S30, and the call exchange server 33 sends the call to the terminal 36 in charge of command. When there is a response, a process is executed to connect the cabin telephone terminal 11A, which is the source of the emergency request, to the terminal 36 in charge of commands (step S31).
By executing the above process, it is possible to establish a call session between the passenger cabin call terminal 11A and the station staff terminal 37 at the next stop of the train using the public wireless communication system, and also to establish If there is no response from the staff terminal 37, a call session can be established between the guest room call terminal 11A and the terminal 36 in charge of commands.

Furthermore, through the above-described process, when there is an emergency request to notify of the occurrence of a sudden illness, the call exchange server 33 automatically establishes a communication route between the cabin call terminal 11A of the train in question and the station staff terminal 37 at the next stop station. In order to establish this, the staff at the next station who receives the notification can promptly make arrangements to respond to the sudden illness.
Further, when an emergency request is made, an alarm is notified to the terminal 36 in charge of the command, so that the person in charge of the command can grasp the situation of occurrence of the emergency request call.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications and changes are possible. For example, in the above embodiment, when there is an emergency request, the station staff's mobile terminal registered in advance in the database is connected to the cabin telephone terminal, but the dispatcher determines the priority and makes a call. It may be configured such that an instruction is given to the exchange server 33 to connect the line to an appropriate terminal such as a terminal of a station staff member or a terminal of a specialist who can respond the earliest.
Further, in the above embodiment, the case where the call exchange server 33 and the train tracking server 34 are configured as separate servers is described, but it is also possible to configure the call exchange server 33 and the train tracking server 34 as one server. .

Furthermore, by configuring a system in which passengers download a pre-designated application to their mobile terminals, and the vehicle notifies the passenger's mobile terminal of the ID of the train they board, the call exchange server can communicate with the passenger's mobile terminal. It is also possible to configure a system that allows calls based on the transmitted train ID, position information of passenger mobile terminals, and passenger information. With this configuration, passengers can communicate with each other by text while sitting in their seats.

10 On-board system 11A Cabin call terminal 11B Crew call terminal 12 ATO on-board device (automatic driving control device)
13 ATO communication mobile station 20 Train operation system 21 Business closed network 22 ATO ground equipment 23 External connection server (external connection control device)
24 Operation control central device (operation control device)
25 ATO base station 30 Call switching system 31 Public radio communication network 32 On-vehicle-to-ground call network 33 Call switching server (linking means, communication route establishment means)
34 Train tracking server 35 Wireless communication base station 36 Terminal for command staff 37 Mobile terminal for station staff

Claims (5)

An on-board system equipped with multiple cabin call terminals capable of wireless communication installed in each passenger cabin of a train, crew call terminals capable of wireless communication installed in the driver's seat, and a mobile station that performs wireless communication in a predetermined frequency band. ,
a train operation system that is equipped with an operation management device and a closed network and is capable of transmitting and receiving information to and from each running train through communication with the mobile station;
a public radio communication network and an on-vehicle-to-ground communication network connected to the closed area network;
a call exchange server connected to the onboard-to-ground call network and having a storage means storing a list in which cabin call terminals and crew call terminals are grouped for each train;
A train communication system comprising:
The cabin call terminal and the crew member call terminal are communication terminals capable of wireless communication via a public wireless communication network,
The train operation system is
a position information storage means for storing track location information of each train acquired by transmitting and receiving information with each running train;
External connection control means for controlling the connection between the closed network and the on-board-to-ground communication network,
The call exchange server includes:
associating means for storing the on-track position information of each train acquired from the position information storage means in a manner associated with cabin telephone call terminals and crew telephone call terminals in the list;
communication path establishment means for selecting and calling a corresponding crew member telephone terminal based on the information of the linking means when there is a call request from the cabin telephone terminal;
A train call system characterized by comprising: 2. The communication path establishing means is configured to establish a line connection between the passenger cabin telephone terminal and a commanding terminal when there is no response from the crew telephone terminal. Train communication system. The call exchange server is configured to be capable of transmitting information regarding the call requests from the plurality of guest room call terminals to a terminal in charge of command when there are call requests from a plurality of different guest room call terminals. The train communication system according to claim 1 or 2. comprising a train tracking server that acquires and stores the location information of each train from the location information storage means via the onboard-to-ground communication network;
Any one of claims 1 to 3, wherein the associating means acquires the on-track position information of each train from the train tracking server and stores it in association with the cabin call terminals and crew call terminals in the list. The train call system described in . When there is an emergency request from a train passenger via the public wireless communication network, the call exchange server determines the next stop of the train based on the train's location information obtained from the train tracking server. The train is configured to search for a station, obtain communication connection information of a mobile terminal owned by a station staff member at the station, and connect the train's cabin telephone terminal and the mobile terminal to enable communication. The train communication system according to claim 4.

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