CN115009327A - Train resource release method and device - Google Patents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
- B61L23/22—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in two directions over the same pair of rails
- B61L23/26—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in two directions over the same pair of rails with means for actuating signals from the vehicle or by passage of the vehicle
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Abstract
The invention provides a method and a device for releasing train resources, wherein the method comprises the following steps: under the condition that each logic section driven away by the minimum safe rear end of the train does not belong to a turnout area, sending an instruction for releasing the current logic section to an OC to which the logic section belongs; determining an emergency braking distance according to the current speed under the condition that the logic section belongs to a turnout area; determining a result of sending a logic zone releasing instruction to the OC according to the relationship between the distance and the maximum backward sliding distance of the train; wherein, the sum of the distances is the sum of the emergency braking distance and the distance from the tail of the vehicle to the boundary; the distance from the tail to the boundary is the distance from the minimum safe rear end of the train to the boundary point of the nearest logic section of the distance between the tail and the driving fork. On the basis of high reliability, the method greatly reduces communication delay and calculation delay required by judging the release condition by the OC, so that the OC can distribute the released resources to other trains in advance, the resource release and reuse efficiency is improved, and the operation efficiency is further improved.
Description
Technical Field
The invention relates to the field of rail transit, in particular to a method and a device for releasing train resources.
Background
In the existing Train-to-Train communication scheme, a Train does not apply and release section resources, but sends a plan to perform path planning and path locking through an Automatic Train Supervision (ATS) system, so that the movement authorization of the Train is calculated according to the locked path, all resources on the line are mastered in an OC (object controller), and when the Train runs away from the resources which are not used any more, the OC can only judge whether the resources can be used by other trains.
In the current resource release method, when a train leaves a resource which is no longer needed to be used, whether a section meets an unlocking condition can be judged only through an OC (open channel) to determine whether the section resource is released. Considering that relatively large calculation overhead exists in calculation of all section resources by the OC and time overhead of communication delay exists due to communication between a train needing to go and return for many times and the OC when relevant information is transmitted, the existing method cannot release the section resources in time, and the utilization efficiency of line resources needs to be improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method and a device for releasing train resources.
The invention provides a train resource release method, which comprises the following steps: under the condition that each logic section driven away by the minimum safe rear end of the train does not belong to a turnout area, sending an instruction for releasing the current logic section to an OC to which the logic section belongs; determining an emergency braking distance according to the current speed under the condition that the logic section belongs to a turnout area; determining a result of sending the instruction for releasing the logic section to the OC according to the distance and the size relation with the maximum backward sliding distance of the train; wherein the sum of the distances is the sum of the emergency braking distance and the distance from the tail of the vehicle to the boundary; the distance from the tail to the boundary is the distance from the minimum safe rear end of the train to the boundary point of the nearest logic section of the distance between the tail and the tail of the train and the fork.
According to the train resource release method provided by the invention, the step of determining the emergency braking distance according to the current speed comprises the following steps: and determining the emergency braking distance according to the current speed, the maximum emergency braking acceleration and the slope acceleration obtained when the train is at the worst slope.
According to the method for releasing the train resources, the emergency braking distance is determined according to the current speed, the maximum emergency braking acceleration and the slope acceleration obtained when the train is at the worst slope, and the method comprises the following steps: determining a comprehensive acceleration according to the sum of the maximum emergency braking acceleration and the slope acceleration; and determining the emergency braking distance according to the comprehensive acceleration and the current speed.
According to the method for releasing the train resources provided by the invention, the step of determining the result of sending the instruction for releasing the logic section to the OC according to the relationship between the distance and the maximum back-sliding distance of the train comprises the following steps: in the event that the sum of the distances is greater than the train maximum back-slide distance and the train is not in the platform area, sending an instruction to the OC to release the logical zone.
According to the train resource release method provided by the invention, the determining the result of sending the instruction for releasing the logic section to the OC according to the distance and the size relation with the maximum back-sliding distance of the train comprises the following steps: acquiring the maximum retrogression distance of the train under the condition that the sum of the distances is larger than the maximum backward sliding distance of the train and the train is in the platform area; in the event that the sum of the distances is greater than the train maximum retreat distance, an instruction is sent to the OC to release the logical zone.
According to the train resource release method provided by the invention, the method further comprises the following steps: and determining the judgment result of the train in the platform area according to the position relation between the maximum safe front end of the train and the platform area.
The invention also provides a train resource releasing device, which comprises: the first processing module is used for sending an instruction for releasing the current logic section to the OC to which the logic section belongs under the condition that each logic section driven away from the minimum safe rear end of the train does not belong to a turnout area; the distance acquisition module is used for determining an emergency braking distance according to the current speed under the condition that the logic section belongs to a turnout area; the second processing module is used for determining a result of sending the instruction for releasing the logic section to the OC according to the relationship between the distance and the maximum backward sliding distance of the train; wherein the sum of the distances is the sum of the emergency braking distance and the distance from the tail of the vehicle to the boundary; the distance from the tail to the boundary is the distance from the minimum safe rear end of the train to the boundary point of the nearest logic section of the distance between the tail and the turnout point.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein when the processor executes the program, the method for releasing the train resources is realized.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a train resource release method as in any one of the above.
The invention also provides a computer program product comprising a computer program, wherein the computer program is used for realizing the train resource release method when being executed by a processor.
According to the method and the device for releasing the train resources, for a turnout area, the release of the resources is determined according to the distance and the size relation with the maximum backward sliding distance of the train, the phenomenon that the backward sliding of the train in the turnout section invades the released resources is avoided, the reliability of the released resources is improved, on the basis of meeting the reliability, the resource release information is initiated to the OC through each train owner, the communication delay and the calculation delay required by the OC for judging all release conditions are greatly reduced, the OC can distribute the released resources to other trains in advance, the efficiency of resource release and reutilization is improved, and the operation efficiency of the trains is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a train resource release method provided by the present invention;
FIG. 2 is a schematic structural diagram of a train resource release device provided by the present invention;
fig. 3 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The following describes a train resource release method and apparatus according to the present invention with reference to fig. 1 to 3. Fig. 1 is a schematic flow chart of a train resource release method provided by the present invention, and as shown in fig. 1, the present invention provides a train resource release method, including:
101. and under the condition that each logical section where the minimum safe rear end of the train drives away does not belong to the turnout area, sending a command for releasing the current logical section to the OC to which the logical section belongs.
In the invention, the train actively participates in the management of line resources, and the execution main body of the method is vehicle-mounted equipment. For example, the ATP may automatically detect the actual operation position of the Train, and each step of the method is performed by a related device of an Automatic Train Protection subsystem (ATP).
Further, according to the train positioning accuracy model, the running distance value has an error, which is generally called a confidence Interval (confidence Interval), i.e., an estimation range of the train position estimation value, and the confidence Interval is determined by the vehicle-mounted device distance measurement accuracy and the ground transponder installation accuracy. And adding a confidence interval value by taking the train position estimation value as a middle nominal value to obtain the maximum safety rear end and the minimum safety rear end of the train. And if the minimum safe rear end of the train drives away from the current logical zone, the train can be considered to actually drive away from the current logical zone.
And the train-mounted equipment acquires the displacement information of the train and judges the current logical section of each driving away. When the minimum safe rear end of the train drives away from the current logical zone needing to be judged, whether the current logical zone belongs to the turnout area is determined, and if the current logical zone does not belong to the turnout area, an instruction for releasing the current logical zone is sent to the OC to which the current logical zone belongs so as to release the line resources of the current logical zone.
102. And under the condition that the logic section belongs to the turnout area, determining the emergency braking distance according to the current speed.
If rowIf the logical zone where the minimum safe rear end of the train is driven away is the turnout zone, the maximum emergency braking distance needs to be calculated according to the current speed of the train and is recorded as S Emergency system 。
103. And determining a result of sending the instruction for releasing the logic section to the OC according to the distance and the size relation with the maximum back-sliding distance of the train.
The sum of the distances is the sum of the emergency braking distance and the distance from the tail to the boundary and is marked as S Emergency system +S Tail to boundary . Wherein S is Tail to boundary The distance from the tail of the train to the boundary is specifically the distance from the minimum safe rear end of the train to the boundary point of the closest logical zone (the direction close to the parking space) to the fork in the driving distance.
According to the distance and the relation with the maximum back-sliding distance of the train, e.g. S Emergency system +S Tail to boundary ＞S Back slide If the instruction is not sent to the OC, the instruction for releasing the logic section is sent to the OC, otherwise, the instruction for releasing the logic section is not sent to the OC.
Based on the scheme of the invention, the resources of the section can be divided into small sections under the optimal condition, the application and release efficiency of the resources can reach the optimal effect, and meanwhile, the train can know whether the resources are available in real time, thereby responding in time.
According to the train resource release method, for the turnout area, the release of resources is determined according to the distance and the maximum backward sliding distance between the turnout area and the train, the situation that the train enters the released resources in the turnout section backward sliding is avoided, the reliability of the released resources is improved, on the basis of meeting the reliability, resource release information is initiated to the OC through each train driver, communication delay and calculation delay required by judging all release conditions by the OC are greatly reduced, the OC can distribute the released resources to other trains in advance, the efficiency of resource release and reutilization is improved, and the operation efficiency of the trains is further improved.
In one embodiment, the determining the emergency braking distance according to the current speed includes: and determining the emergency braking distance according to the current speed, the maximum emergency braking acceleration and the slope acceleration obtained when the train is at the worst slope.
Wherein the maximum emergency braking acceleration is the acceleration corresponding to the maximum emergency braking rate of the train and is recorded as alpha Maximum emergency braking . The slope acceleration obtained when the train is at the worst slope is determined according to the worst slope and the train rotating mass coefficient and is recorded as alpha Worst slope 。α Worst slope The calculation method is as follows:
α worst slope -worst grade/train rotating mass coefficient.
According to the method provided by the embodiment of the invention, the emergency braking distance is determined through the maximum emergency braking acceleration and the slope acceleration obtained when the train is at the worst slope, the worst factors of the emergency braking of the train are integrated, and the train can not invade the released turnout resources after the resources of the turnout section are released.
In one embodiment, the determining the emergency braking distance according to the current speed, the maximum emergency braking acceleration, and the slope acceleration obtained when the train is at the worst slope includes: determining a comprehensive acceleration according to the sum of the maximum emergency braking acceleration and the slope acceleration; and determining the emergency braking distance according to the comprehensive acceleration and the current speed.
The specific formula can be expressed as follows:
the embodiment of the invention fully considers the minimum distance from emergency to stable stop of the train under the worst condition, and when the minimum distance meets the release condition of the section resources, the minimum distance can ensure that the train can not invade the released resources again, even if the front train runs backwards for a distance due to retrogression, the position safety between the trains can be ensured, and the safe release of the road resources is finally realized.
In one embodiment, the determining a result of sending the instruction to release the logical zone to the OC according to the distance and a size relationship with a maximum back-sliding distance of the train comprises: in the event that the sum of the distances is greater than the train maximum back-slide distance and the train is not in the platform area, sending an instruction to the OC to release the logical zone.
In the embodiment of the invention, when S is satisfied Emergency system +S Tail to boundary ＞S Back slide In the case of (3), it is determined whether the train is located in the platform area, instead of directly releasing the corresponding logical segment. And when the train is determined not to be in the platform area, the logic section resources which can be unlocked between the train tail and the turnout can be directly unlocked.
According to the method provided by the embodiment of the invention, whether the train is positioned in the platform area is judged again on the basis that the distance sum is larger than the maximum backward sliding distance of the train, so that the condition that the train needs to be backed and regressed to invade released resources when being positioned in the platform area is avoided, and the reliability of resource release is improved.
In one embodiment, the determining a result of sending the instruction to release the logical zone to the OC according to the distance and a size relationship with a maximum back-sliding distance of the train comprises: acquiring the maximum retrogression distance of the train under the condition that the distance sum is greater than the maximum backward sliding distance of the train and the train is in the platform area; in the event that the sum of the distances is greater than the train maximum retreat distance, an instruction is sent to the OC to release the logical zone.
In the embodiment of the present invention, when the above S is satisfied Emergency system +S Tail to boundary ＞S Back slide Under the condition of (1), and under the condition that the current train is in a platform area, the logic section resources which can be unlocked between the train tail and the turnout are not directly unlocked. But further considers the maximum retrogression distance of the train and is marked as S Retrogression 。
When S is Emergency system +S Tail to boundary ＞S Retrogression And unlocking the logic section resources which can be unlocked between the tail of the vehicle and the turnout, and sending an instruction for releasing the current logic section to the OC.
According to the embodiment of the invention, when the minimum distance meets the release condition of the zone resources, even if the front vehicle runs backwards for a corresponding distance due to the retrogression, the position safety between the vehicles can be ensured, and the reliable release of the zone resources is realized.
In one embodiment, the method further comprises: and determining the judgment result of the train in the platform area according to the position relation between the maximum safe front end of the train and the platform area.
Namely, when the maximum safe front end of the train is positioned in the platform area, the train is judged to be in the platform area, otherwise, the train is not in the platform area. The judgment result of the train in the platform area is determined according to the position relation between the maximum safe front end of the train and the platform area, the position safety between the trains is ensured under the worst condition, and the reliability of resource release of the section is improved.
The train resource releasing device provided by the invention is described below, and the train resource releasing device described below and the train resource releasing method described above can be referred to correspondingly.
Fig. 2 is a schematic structural diagram of a train resource release device provided by the present invention, and as shown in fig. 2, the train resource release device includes: a first processing module 201, a distance acquisition module 202 and a second processing module 202. The first processing module 201 is configured to send an instruction to release a current logical zone to an OC to which each logical zone belongs when each logical zone where the minimum safe rear end of the train drives away does not belong to a turnout area; the distance obtaining module 202 is configured to determine an emergency braking distance according to the current speed when the logical section belongs to a turnout area; the second processing module 203 is configured to determine, according to a relationship between the distance and a maximum back-sliding distance of the train, a result of sending the instruction for releasing the logical segment to the OC; wherein the sum of the distances is the sum of the emergency braking distance and the distance from the tail of the vehicle to the boundary; the distance from the tail to the boundary is the distance from the minimum safe rear end of the train to the boundary point of the nearest logic section of the distance between the tail and the tail of the train and the fork.
In one embodiment, the distance acquisition module 202 is configured to: and determining the emergency braking distance according to the current speed, the maximum emergency braking acceleration and the slope acceleration obtained when the train is at the worst slope.
In one embodiment, the distance obtaining module 202 is specifically configured to: determining a comprehensive acceleration according to the sum of the maximum emergency braking acceleration and the slope acceleration; and determining the emergency braking distance according to the comprehensive acceleration and the current speed.
In one embodiment, the second processing module 203 is configured to: in the event that the sum of the distances is greater than the train maximum back-slide distance and the train is not in the platform area, sending an instruction to the OC to release the logical zone.
In one embodiment, the second processing module 203 is configured to: acquiring the maximum retrogression distance of the train under the condition that the distance sum is greater than the maximum backward sliding distance of the train and the train is in the platform area; in the event that the sum of the distances is greater than the train maximum retreat distance, an instruction is sent to the OC to release the logical zone.
In one embodiment, the second processing module 203 is configured to: and determining the judgment result of the train in the platform area according to the position relation between the maximum safe front end of the train and the platform area.
The device embodiment provided in the embodiments of the present invention is for implementing the above method embodiments, and for details of the process and the details, reference is made to the above method embodiments, which are not described herein again.
The implementation principle and the generated technical effects of the train resource release device provided by the embodiment of the invention are the same as those of the train resource release method embodiment, and for brief description, corresponding contents in the train resource release method embodiment can be referred to where the train resource release device embodiment is not mentioned.
Fig. 3 is a schematic structural diagram of an electronic device provided in the present invention, and as shown in fig. 3, the electronic device may include: a processor (processor)301, a communication Interface (communication Interface)302, a memory (memory)303 and a communication bus 304, wherein the processor 301, the communication Interface 302 and the memory 303 complete communication with each other through the communication bus 304. Processor 301 may invoke logic instructions in memory 303 to perform a train resource release method comprising: under the condition that each logic section driven away by the minimum safe rear end of the train does not belong to a turnout area, sending an instruction for releasing the current logic section to an OC to which the logic section belongs; determining an emergency braking distance according to the current speed under the condition that the logic section belongs to a turnout area; determining a result of sending the instruction for releasing the logic section to the OC according to the distance and the size relation with the maximum backward sliding distance of the train; wherein the sum of the distances is the sum of the emergency braking distance and the distance from the tail of the vehicle to the boundary; the distance from the tail to the boundary is the distance from the minimum safe rear end of the train to the boundary point of the nearest logic section of the distance between the tail and the turnout point.
In addition, the logic instructions in the memory 303 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being stored on a non-transitory computer readable storage medium, wherein when the computer program is executed by a processor, a computer is capable of executing the train resource release method provided by the above methods, and the method includes: under the condition that each logic section driven away by the minimum safe rear end of the train does not belong to a turnout area, sending a command for releasing the current logic section to an OC to which the logic section belongs; determining an emergency braking distance according to the current speed under the condition that the logic section belongs to a turnout area; determining a result of sending the instruction for releasing the logic section to the OC according to the distance and the size relation with the maximum backward sliding distance of the train; wherein the sum of the distances is the sum of the emergency braking distance and the distance from the tail of the vehicle to the boundary; the distance from the tail to the boundary is the distance from the minimum safe rear end of the train to the boundary point of the nearest logic section of the distance between the tail and the tail of the train and the fork.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements a method for releasing train resources provided by the above methods, the method including: under the condition that each logic section driven away by the minimum safe rear end of the train does not belong to a turnout area, sending an instruction for releasing the current logic section to an OC to which the logic section belongs; determining an emergency braking distance according to the current speed under the condition that the logic section belongs to a turnout area; determining a result of sending the instruction for releasing the logic section to the OC according to the distance and the size relation with the maximum backward sliding distance of the train; wherein the sum of the distances is the sum of the emergency braking distance and the distance from the tail of the vehicle to the boundary; the distance from the tail to the boundary is the distance from the minimum safe rear end of the train to the boundary point of the nearest logic section of the distance between the tail and the tail of the train and the fork.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for releasing train resources is characterized by comprising the following steps:
under the condition that each logic section driven away by the minimum safe rear end of the train does not belong to a turnout area, sending an instruction for releasing the current logic section to an OC to which the logic section belongs;
determining an emergency braking distance according to the current speed under the condition that the logic section belongs to a turnout area;
determining a result of sending the instruction for releasing the logic section to the OC according to the distance and the size relation with the maximum backward sliding distance of the train; wherein the sum of the distances is the sum of the emergency braking distance and the distance from the tail of the vehicle to the boundary; the distance from the tail to the boundary is the distance from the minimum safe rear end of the train to the boundary point of the nearest logic section of the distance between the tail and the tail of the train and the fork.
2. The train resource release method of claim 1, wherein the determining an emergency braking distance based on the current speed comprises:
and determining the emergency braking distance according to the current speed, the maximum emergency braking acceleration and the slope acceleration obtained when the train is at the worst slope.
3. The train resource release method of claim 2, wherein the determining the emergency braking distance based on the current speed, the maximum emergency braking acceleration, and a slope acceleration obtained when the train is at a worst slope comprises:
determining a comprehensive acceleration according to the sum of the maximum emergency braking acceleration and the slope acceleration;
and determining the emergency braking distance according to the comprehensive acceleration and the current speed.
4. The method for releasing train resources according to claim 1, wherein said determining the result of sending the instruction to release the logical segment to the OC according to the distance and the magnitude relation with the maximum back-sliding distance of the train comprises:
in the event that the sum of the distances is greater than the train maximum back-slide distance and the train is not in the platform area, sending an instruction to the OC to release the logical zone.
5. The method for releasing train resources according to claim 1, wherein said determining the result of sending the instruction to release the logical zone to the OC according to the distance and the size relation with the maximum back-sliding distance of the train comprises:
acquiring the maximum retrogression distance of the train under the condition that the distance sum is greater than the maximum backward sliding distance of the train and the train is in the platform area;
in the event that the sum of the distances is greater than the train maximum retreat distance, an instruction is sent to the OC to release the logical zone.
6. The train resource release method according to claim 4 or 5, characterized by further comprising:
and determining the judgment result of the train in the platform area according to the position relation between the maximum safe front end of the train and the platform area.
7. A train resource release apparatus, comprising:
the first processing module is used for sending an instruction for releasing the current logic section to the OC to which the logic section belongs under the condition that each logic section driven away from the minimum safe rear end of the train does not belong to a turnout area;
the distance acquisition module is used for determining an emergency braking distance according to the current speed under the condition that the logic section belongs to a turnout area;
the second processing module is used for determining a result of sending the instruction for releasing the logic section to the OC according to the relationship between the distance and the maximum backward sliding distance of the train; wherein the sum of the distances is the sum of the emergency braking distance and the distance from the tail of the vehicle to the boundary; the distance from the tail to the boundary is the distance from the minimum safe rear end of the train to the boundary point of the nearest logic section of the distance between the tail and the tail of the train and the fork.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the train resource release method according to any one of claims 1 to 6.
9. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the train resource release method according to any one of claims 1 to 6.
10. A computer program product comprising a computer program, wherein the computer program when executed by a processor implements the train resource release method of any one of claims 1 to 6.
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