JP2000043726A - Railway control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly seek a cause of a failure, and to resume normal service by providing on a station display control device a storage part to store various input data in a district of a self station in the time series, a failure inference part to infer the cause of the failure based on the stored content when the failure occurs, and a memory means to preserve the inferred result. SOLUTION: In a station display control device 1 to appropriately classify and transmit the train data received from a center command station to a concourse display, a platform display, etc., of the station, when the guide display system is failed, a malfunction and an abnormal operation of each module are detected by a CPU 21, and a failure signal is outputted through a series transmission module 22. This failure signal is transmitted to a failure information collection display device through a modem 19b, and the failure condition is recorded by a record and inference module 50. The accident analysis is effected according to a fault tree analysis or the fuzzy neural network method, the failure is inferred, and the inferred result is stored in a memory, and transmitted/received to/from the displays in a wireless manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a train control device represented by a train operation management and a passenger guidance display device.

[0002]

2. Description of the Related Art In recent years, the field of railway control devices has been digitized, and it has become possible to quickly and accurately transmit various information to the field of guidance display devices for passengers.

FIG. 14 shows a typical configuration example of a conventional railway control device provided with this kind of passenger guidance display device. This device transmits data such as train schedule, destination, and type transmitted from a higher-level device such as the Central Command Office to each station via a wide-area transmission device, and at each station receiving the transmission data, via a station display control device. Display on a display device such as an LED. The station display control device 1 provided at each station includes a concourse indicator 2 installed at the concourse of the station, a platform indicator 3 installed at the platform, and an approach display installed at the platform to notify the arrival of the train. The display unit 4 is connected to the display unit 4 and controls the display content of each display device so as to display the display content according to a predetermined place on each display device. Station display control device 1
In step (3), the information of the approach of the train and the update information of the display data are obtained from the track signal device 5 and transmitted to the host device or the display content of the display is updated as necessary.

[0004] The running monitoring of the train is performed by a central command office, which is a host device. The operation control device 1
The operation management device 10 includes a passenger guidance central device 11 including a console 12 and a remote terminal device 13. Central passenger guidance device 11 and station display control device 1
Is a wide-area data transmission line 1 mainly composed of an optical transmission device LAN.
4 are connected. The command from the Central Command is
The signal is transmitted to the wide area data transmission line 14 via the passenger guidance central device 11 and the far terminal device 13 and further transmitted to the station display control device 1 via the far terminal device 15 on the station side.

[0005] The station display control device 1 is also provided with a character input device 16 and a failure information collection and display device 17. The character input device 16 is installed in a station office or the like, and has a modem 18a, 1
8b, it is connected to the station display control device 1. The character input device 16 is used to input characters for displaying an event guide or a transit guide unique to each station on the displays 2 and 3. More specifically, a )
Other line starting guide, b) last train guide, c) transit guide, d) general guide (for example, events related to stations),
e) It is provided to realize detailed services unique to each station such as emergency information. The failure information collection and display device 17 is provided for each maintenance management section in units of all stations or a plurality of stations within a certain range.
a, and is connected to the station display control device 1 through 19b, and sends collected data to the station display control device 1 in order to manage what failure has occurred at which station.

The central command office creates a different train schedule (departure time, etc.) for each station and transmits the train schedule to the station display control device 1 of each station via the wide area data transmission line 14 at a high speed. Therefore, this transmission data is of many types corresponding to the number of stations on the route.

FIG. 15 shows the station display control device 1 shown in FIG.
2 shows a detailed configuration of the concourse display 2. In addition, even if the display is the home display 3 or the approach display 4, it has the same configuration as hardware, and here, the concourse display 2 will be described as a representative.

[0008] The station display control device 1 is a communication room of a station (usually,
It is installed in an unmanned room that is energized for 24 hours. here,
In addition to the microprocessor (CPU) 21, the modem 19
b) Serial transmission module (SIO) for receiving failure information from
-1) 22, a ROM module 23 for storing programs for the CPU 21, an input / output (I / O) module 24 of a digital configuration, a serial transmission module (SI
O-2) 25, a serial transmission module (SIO-3) 26 for inputting character data from the modem 18b, a RAM 27 for temporary storage, and a serial transmission module (SIO-4) for transmitting data to the concourse display 2. ) 28 and a modem 29 for receiving train data from the Central Command. These various modules provided in the station display control device 1 are connected to the CPU 21 via a bus line 21a.

Next, the internal configuration of the concourse display 2 will be described. The concourse display 2 includes a microprocessor (CPU) 31, a RAM 32 connected to the CPU 31 via a bus line 31a, an I / O module 33, and a serial transmission module (SIO) for receiving control signals from the station display control device 1. 35, a ROM 36, and a display control module (CTR-C) 37. A test switch 34 is connected to the I / O module 33, and an LED module 39 is connected to the display control module 37 via an LED interface module 38. The LED module 39 is a substantial part of the concourse display 2 and has a 24 × 24 dot module or 1
It is composed of an aggregate of 6 × 16 dot modules. In the concourse indicator 2, the serial transmission module 35 receives display data from the serial transmission module 28 of the station display control device 1, and the CPU 31 switches the data to display stages, colors, external characters, Japanese or English, and the like. And finally L
It is displayed on the ED module 39. When the switch 34 is turned on, the test pattern in the ROM 36 operates, and the LED module 39 according to a predetermined program.
Display the test. This is a function provided for maintenance of the display.

[0010]

The railway control device is a system which covers a very wide area geographically even if it is limited to a passenger guidance display device. Once a failure has occurred in a system having such a wide-range transmission system, it takes time to find the cause, which has a great social impact. Such a display function, which at first glance appears to be merely a service function, is extremely important for stations, especially large stations, and provides passengers with information on the failure itself, information on the restoration of the failure, etc. If you don't tell them properly, it can lead to great confusion. Guidance indicators provided at various parts of the station play a part of such information transmission, and the contents of the guidance display are controlled by the station display control device.

In any case, it is necessary to perform recovery from a failure such as a failure in the railway system in as short a time as possible. In such a case, the guidance display device is required to have a high operation system gradually from the inevitable demand of the station that the service needs to be improved even if the number of station staff is reduced. It is becoming.

However, the conventional system has the following major problems. (1) Systems mainly based on transmission functions are often already restored when service personnel rush to the station from a place far away from the station due to frequent transient failures,
It is not uncommon for a failure to be treated as unknown without knowing the cause of the failure. (2) Once a failure has occurred, information from the failure information collection and display device can be used to determine at which station and which equipment the failure has occurred, but it is not known what type of failure has occurred. Often. (3) In such a railway control system, in order to shorten the interruption time of the system operation as much as possible, a fallback function for continuing the function while lowering the level in the remaining normal system part even if a failure occurs in a part is provided. Usually provided, resulting in a very expensive system.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned inconvenience, and an object of the present invention is to provide an inexpensive railway control device capable of pursuing and restoring the cause as quickly as possible when an accident or the like occurs. It is assumed that.

[0014]

According to a first aspect of the present invention, there is provided a railway control device, which comprises: a higher-level device for transmitting information to a station display control device provided at each station; The station display control device is a railway control device that displays a guide on a passenger guidance display in its own station based on the guide information sent from the higher-level device. A recording unit that stores various input data in time series; a failure inference unit that infers a failure cause based on a record of the recording unit when a failure occurs; and a memory unit that stores an inference result of the failure inference unit. It is characterized by having.

According to a second aspect of the present invention, in the railway control device according to the first aspect, the fault inference unit of the station display control device performs an accident analysis in accordance with a fault tree analysis method to perform a fault inference. It is a feature.

According to a third aspect of the present invention, in the railway control device according to the first aspect, the fault inference unit of the station display control device performs an accident analysis by a fuzzy neural network technique to perform a fault inference. It is assumed that.

The invention according to claim 4 is the invention according to claims 1 to 3
In the railway control device according to any one of the above, a recording unit, a failure inference unit and a memory unit having the same configuration as the recording unit, the failure inference unit and the memory unit provided in the station display control device are also provided in the display. It is characterized by having.

The invention according to claim 5 is the invention according to claims 1 to 4
In the railway control device according to any one of the above, the station display control device and the display each have a means for wirelessly transmitting and receiving a failure record and a failure inference result at the time of failure between the station display control device and the display. It is characterized by having.

The invention according to claim 6 is the invention according to claims 1 to 5
In the railway control device according to any one of, a hand-held type that can transmit and receive data wirelessly between the station display control device and the display, and can give an operation instruction wirelessly to the station display control device and the display. A maintenance device is provided.

According to a seventh aspect of the present invention, in the railway control device according to the sixth aspect, the station display control device and the display device include means for performing at least a part of the function test in accordance with an instruction from the maintenance device. It is characterized by the following.

The invention according to claim 8 is the invention according to claims 1 to 4.
The railway control device according to any of the above, further comprising a system failure inference unit that infers a failure cause of the entire system based on an inference result inferred by the failure inference unit of each station display control device. is there.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Configuration of Embodiment 1) FIG. 1 shows an example of a configuration of a railway control device provided with a station display control device according to the present invention. The station display control device 1 shown in FIG. 1 differs from the conventional device shown in FIG. 15 in that the recording inference module 50 is connected to the bus line 21a, and the other components remain unchanged.

FIG. 2 shows the internal configuration of the failure inference module 50. The failure inference module 50 includes a microprocessor (CPU) 51, an input / output interface 52, a bus input / output controller 53, an inference unit 54 for inferring the cause of failure, a ROM 55, a RAM 56, an analog / digital conversion unit 57, and a serial transmission signal interface 58. It has. Each of these functional elements is connected to the CPU 51 via the bus line 51a.

(Operation of Embodiment 1) The operation of the apparatus shown in FIGS. 1 and 2 will be described with reference to FIGS. The basic function of the station display control device 1 is to receive the train data from the central command center, appropriately transmit the train data to the concourse display 2 or the platform display 3 of the station and to display the intended display. When a failure occurs in the guidance display system, the station display control device 1 or various serial transmission modules and the like independently detect a transmission trouble with the transmission destination as a failure. When the microprocessor 21 detects a malfunction or an abnormal operation of each module, it outputs a failure signal via the serial transmission module 22. This failure signal is transmitted to the modems 19b and 19 shown in FIG.
The information is transmitted to the failure information collecting and displaying device 17 via the line a.

In the conventional apparatus, information on a failure location is output. However, even when the operation returns to the normal operation, it is unclear what reason or cause caused the failure or the failure. Therefore, in many cases, permanent treatment could not be taken.

In the present invention, the fault condition is first recorded by the record inference module 50. The details of the record inference module 50 are as shown in FIG. First, the bus input / output controller 53 periodically takes in various information data from the bus line 21a of the station display control device 1 to the bus line 51a. For example, an analog conversion module 57 connected to the output side of the power supply is provided so that the state when the power supply fluctuates or an instantaneous power failure occurs can be immediately detected. As described above, the failure inference module 50 has a function of regularly taking in data from the station display control device 1 and a function of collecting failure data by the recording inference module 50 itself.

The input / output interface 52 is connected to a keyboard of a computer so that a signal required for trigger monitoring at the time of failure can be set arbitrarily.

When the CPU 21 of the station display control device 1 detects a failure, the failure inference module 50 loads the operation information of each part into the area of the RAM 56. FIG. 3 shows a memory map in the RAM 56. Various recording data captured by the bus input / output controller 53 is written to the first group of memories. For example, when no failure or malfunction occurs in the area of addresses 000 to FFF, the data can be written endlessly. That is, as long as no failure occurs, the updated data is written in the overwritten state into the memory where the new recording is determined, such as address 000 → FFF → 000 → FFF.

Update recording is stopped by a trigger signal when a minor failure or a major failure occurs. At this time, the recording storage time can be set to a time t1 before the occurrence of the failure and a time t2 thereafter. However, the memory recording time t1 + t2
Is constant. This means that if there are a plurality of trigger signals, a plurality of times can be set.

When the failure data is written in the first group area of the memory as shown in the present embodiment, the CPU 51 immediately sets the first group memory area as an overwrite-protected area and disables writing. Instead, it allows access to the second group memory area. Since failures can occur consecutively, switching during failure recording is performed instantaneously. Further, calendar information such as date and time and time (in seconds) is also written in this memory.

Next, regarding the function of the inference unit 54, there are two ways. (1) Fault Inference by FTA (Fault Tree Analysis = Fault Tree Analysis) FIG. 4 shows an example of an FTA in which a fault of the station display control device 1 is analyzed from both hardware and software. This figure summarizes the possible causes of failure at the time of design. The figure shows that, for example, if the phenomenon "display stop / failure signal output" occurs as shown on the left side, any of the factors shown in the failure cause item block shown on the right side can be considered as the cause, Specifically, 17 types of failure factors from “output relay failure” to “alarm control by external failure R” are illustrated. By fetching the right factor from the bus line 21a, the cause can be immediately estimated when a failure occurs. In this method, if the FTA analysis is accurate and the FTA analysis is performed for each component of the station display control device 1, a failure can be efficiently inferred. However, there is a disadvantage that the accuracy of the inference is reduced when the component deteriorates and sometimes malfunctions or when there are a plurality of failure factors.

(2) Fault Inference by Neural Network FIG. 5 illustrates the configuration of a neural network. This neural network is created based on the memory mechanism of the human brain, and the input event X
3, an input layer IP in which 1, X2, and X3 are taken in; an intermediate layer IM in which various associations are generated from input events; and an output layer OP in which conclusions are drawn from the associations. ). A value called “coupling weight W” is set between the nodes connected to each other in the three-stage configuration.
When input events X1, X2, and X3 are input to P, these input events are propagated to other intermediate layer nodes IM according to the connection weight W. A relatively large value is input to nodes connected by a large connection weight W. Thus, the input information is propagated, and finally the output value Y is output from the output layer node OP.

The neural network has a learning function of adjusting the input / output characteristics by presenting a desired input / output pattern. In the figure, input events X1, X
When a desired output value for X2 and X3 is given as a learning signal Z, the difference between the output value Y from the neural network and the learning signal Z is input to the learning device 100 as a learning error δ, and the learning device 100 reduces the error δ. The adjustment of each coupling load W is performed in such a manner as to be performed. The function of performing this adjustment is called a learning function of the neural network. As illustrated in FIG.
By repeating the learning using a large number of learning signals Z (horizontal axis), the difference between the output value Y of the neural network and the learning signal Z, that is, the learning error δ (vertical axis) decreases, as shown in FIG. The output value characteristic of the neural network with respect to the input value X is represented by the characteristic 10 of the distributed state before learning.
It is possible to gradually aggregate from 1 to the characteristic 102 aggregated into the characteristic value after learning toward the desired characteristic 103. By providing such software in the inference unit 54 of FIG. 2, the accuracy of inference of the cause of the failure can be improved.

By employing the inference unit 54 having the learning function of the neural network, the accuracy of the inference is improved each time a defect occurs, and the defect can be easily handled only by the maintenance staff. To go.

(Effects of the First Embodiment) By connecting the record inference module 50 of the present invention to the bus line 21a of the computer system of the station display control device 1, the station based on the operation record data at the time of failure or failure can be obtained. The cause can be inferred in the display control device 1. By using the inference result, it is possible to solve a problem in a short time, and it is possible to prevent a situation where a large social problem occurs as a result.

After several years from the initial installation of the railway control device, it is often necessary to modify hardware and software due to factors such as an increase in the number of trains, a drastic change in schedules, and extension of routes. And every time the system is destined to change significantly. In many cases, a new defect is caused again by the system change after the repair. According to the present invention, such a case can be dealt with by changing the software of the recording inference module 50 using a neural network. In particular, the inference function is characterized in that new learning can be continued only by changing the value of the learning signal Z.

As described above, the record inference module 5 of the present invention
0 can flexibly cope with system changes.

(Embodiment 2) FIGS. 8 to 11 show Embodiment 2 of the present invention. The station display control device 1A shown in FIG. 8 is different from the basic station display control device 1 shown in FIG. 1 in that a wireless communication unit is added. That is, the transmitting / receiving module 6 connected to the bus line 21a
0, an amplifier 61 connected to the receiving module,
A transmission / reception antenna 62 connected to the amplifier is provided.

The concourse display 2A shown in FIG.
The concourse indicator 2 shown in FIG. 5 is provided with a failure record inference module 68 and a transmission / reception module 65, an amplifier 66, and a transmission / reception antenna 67.

Concourse indicators have also been increasing in size in recent years, and if the recording of a failure and the inference of the cause can be performed immediately after the accident, the problem can be solved very quickly. However, the failure record inference module 68 uses the station display control device 1A.
May be smaller in size than the record inference module 50 of FIG.

FIG. 10 shows an embodiment of the maintenance device 80 of the handy type. The maintenance device 80 includes a microprocessor (CPU) 81, a RAM 82, and a ROM connected to a bus line 81a.
83, reader / writer module 84, input / output module 85, LCD interface (I / F) module 8
7 and a transmission / reception module 91. A keyboard 86 is connected to the input / output module 85. Further, the LCD interface module 87 serves as an interface to the LCD display 88. The reader / writer module 84 receives I
It writes a record to the C card 90 and reads a record from the IC card 90. The maintenance device 80 has a built-in battery 89. Further, a transmitting / receiving antenna 93 is connected to the transmitting / receiving module 91 through an amplifier 92.

FIG. 11 shows an outline image of the maintenance device 80 of the handy type. As shown in FIG.
3, a keyboard 86 and an LCD display 88 are arranged on one side.

The station display control device 1A shown in FIG. 8, the concourse display 2A shown in FIG. 9, and the maintenance device 80 shown in FIGS. Can be taken out.

In a system over a wide area such as a railway control system, once a failure occurs, nobody except the maintenance staff in charge often starts the investigation. that is,
Touching the device based on half-way recognition of the facts or investigation may further increase the breakdown or trouble. When examining defects that have occurred in the past, it is very likely that a quick solution could be expected if the investigation was started immediately after the defects occurred. In many cases, depending on the situation of the trouble, the trouble continues for a long time and the first phenomenon is rewritten from the failed memory to a new one.

In such a case, if the handy type maintenance device 80 as shown in FIG. 11 can be used to record the faulty device and output the inference result by operating the keyboard 86 without directly touching the faulty device. However, this alone can be very effective in solving problems.
In addition to this operation function, a test pattern program that can be driven using the maintenance device 80 may be incorporated into the station display control device 1A, the concourse display device 2A, the home display device 3, the approach display device 4, and the like. Also, it is possible to confirm the consistency of the record and the inference after the failure, which is extremely effective.

(Embodiment 3) FIG. 12 shows an embodiment 3 in which a system failure record inference device 70 is connected to the far terminal device 13 on the central command post side. As shown in FIG. 13, the system failure record inference device 70
Failure inference is performed by the hierarchically-recorded failure record inference modules 50a and 50b. On the other hand, the recording inference module 5 incorporated in the station display control devices 1, 1A, etc. installed in each station
, 50N, and the inference result are transmitted via the wide area data transmission line 14 to the remote terminal apparatus 1 on the central command center side.
3 and finally collected by a fault inference device 70 that performs fault record inference of the entire system.

The illustrated fault inference device 70 is composed of two layers of failure record inference modules 50a and 50b. However, the scale is expanded to three or four levels according to the system scale, and the system is expanded over a wider area. Can be inferred.

As described above, the failure inference of the entire system is particularly effective when failures over a wide area occur one after another or when failures or troubles occur simultaneously, such as a typhoon or a fire. By knowing the failure and the cause of the entire system, it is possible to immediately give an accurate recovery instruction from the central command center to each station and the like.

As described above, even when a major trouble occurs, the total data can be summed up in a very short time, and the inference result can be quickly derived.

Although the present invention has been described with reference to the limited embodiments, the railway control system includes an operation management system, a CTC device, a relay interlocking device, an ATC / ATO device,
Various systems and devices, such as ITV devices, station communication facilities, centralized telephone facilities, and automatic ticket gate facilities, are mixed, and application to these devices is also possible.

[0051]

According to the present invention, when a failure or a defect that can occur in a wide variety of forms over a wide area is recorded, the failure or the defect is recorded and the cause of the failure is inferred. Since the cause of the failure can be accurately grasped and recovered, the operating rate of the system can be improved. Therefore, it is possible to reduce the scale of a backup function provided in the system in case of a failure, thereby making it possible to configure the system at low cost.

Further, by providing a learning function, it is possible to improve the accuracy of investigating the cause for each failure or failure. For this reason, the recovery time is further reduced, and it is possible to further contribute to improving the operation rate of the system.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a station display control device of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a failure inference module in FIG. 1;

FIG. 3 is a diagram showing an example of a memory map of a RAM in the failure inference module of FIGS. 1 and 2;

FIG. 4 is a diagram showing an example of an FTA (fault tree analysis) of the present invention.

FIG. 5 is an explanatory diagram illustrating a configuration and a learning function of a neural network.

FIG. 6 is an explanatory diagram illustrating the relationship between the number of times of learning of the neural network and the learning error rate.

FIG. 7 is an explanatory diagram illustrating a relationship between an input value and an output value by a learning function.

FIG. 8 is a block diagram of a station display control device according to a second embodiment of the present invention.

FIG. 9 is a block diagram showing an internal configuration of a concourse display according to the second embodiment.

FIG. 10 is a block diagram of a maintenance device according to a second embodiment.

FIG. 11 is a front view showing the outer shape of the maintenance device shown in FIG. 10;

FIG. 12 is a block diagram illustrating a system configuration according to a third embodiment;

FIG. 13 is an explanatory diagram illustrating a failure inference system according to a third embodiment.

FIG. 14 is a block diagram showing a configuration of a conventional railway control system.

FIG. 15 is a block diagram showing an internal configuration of a station display control device and a concourse display device in FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Station display control device 2 Concourse indicator 3 Home indicator 4 Approach indicator 5 Track signal device 10 Operation management device 11 Passenger guidance device 12 Operator console 13 Far end terminal equipment (central command center side) 14 Optical integrated transmission path 15 Remote terminal device (station side) 16 Character input device 17 Failure information collection and display device 21 Microprocessor 31 Microprocessor 39 LED module 50 Record failure inference module 50a Record inference unit 54 Inference unit 51 CPU 54 Inference unit 56 RAM 70 System failure record Inference device 80 Maintenance device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Moriyuki Yanagi 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Plant (72) Inventor Toshikatsu Kawai 1 Toshiba-cho, Fuchu-shi, Tokyo Fuchu, Toshiba F-term in the factory (reference) 5B049 AA04 BB32 CC40 EE12 EE13 EE14 EE56 EE59 GG02 GG03 GG06 5H161 AA01 BB20 GG03 GG11 GG22 JJ01 JJ40

Claims (8)

[Claims] 1. A high-level device sends guidance information for each station to a station display control device provided at each station, and the station display control device transmits its own guidance information based on the guidance information sent from the high-level device. In a railway control device that displays a guide on a passenger guidance display in a station, each station display control device stores a time series of various input data in its own station service, and a record of the recording unit when a failure occurs. 1. A railway control device comprising: a failure inference unit that infers a failure cause based on a failure inference unit; and a memory unit that stores an inference result of the failure inference unit. 2. The railway control device according to claim 1,
A railway control device characterized in that the failure inference unit of the station display control device performs an accident analysis in accordance with a failure tree analysis method and performs a failure inference. 3. The railway control device according to claim 1,
A failure control unit of the station display control device performs a failure analysis by performing an accident analysis by a fuzzy neural network method. 4. The railway control device according to claim 1, wherein the recording unit, the failure inference unit and the memory inference unit are provided in the station display control device. A railway control device, wherein the memory means is also provided on the display. 5. The railway control device according to claim 1, wherein the station display control device and the display device respectively record a failure record and a failure inference result at the time of failure between the station display control device and the display device. A railway control device, comprising: means for wirelessly transmitting and receiving data between the railway control devices. 6. The railway control device according to claim 1, wherein data is transmitted and received wirelessly between the station display control device and the display device, and the train display control device and the display device are transmitted to and received from the station display control device and the display device. A railway control device comprising a handy type maintenance device capable of giving an operation instruction wirelessly. 7. The railway control device according to claim 6,
A railway control device, wherein the station display control device and the display device include means for performing at least a part of the function test in accordance with an instruction from the maintenance device. 8. A system according to claim 1, wherein a failure cause of the entire system is inferred based on an inference result inferred by the failure inference unit of each station display control device. A railway control device comprising: