Objective To realize interoperability between CTCS-2 (China Train Control System Level 2) and CBTC (communication-based train control) systems, it is necessary to study the layout of the shared control zone and the switching method of onboard equipment based on the vehicle-to-ground compatibility scheme.

Method First, according to the operating principles of CTCS-2 and CBTC systems as well as the layout rules of trackside signal equipment, five basic requirements for shared control zone arrangement and onboard equipment switching are proposed. Then, the shared control zone is set up by orderly superimposing the trackside equipment of the CTCS-2 and CBTC systems, and the switching procedure of onboard equipment within the zone is designed. On this basis, given that both CTCS-2 and CBTC systems are integrated with the ATO (automatic train operation) function, adaptive adjustment schemes for shared control zone arrangement and switching procedures are designed. Finally, taking the switching from CTCS-2+ATO to CBTC+ATO as an example, a practical line in the shared control zone is designed using an existing railway line, and both normal and abnormal onboard equipment switching scenarios are simulated and verified in this zone.

Result & Conclusion  The proposed method can support system switching not only for the vehicle onboard split-type and integrated-type equipment, but also for those with ATO function. Under unidirectional operation in railway sections, the proposed method can maintain the mutual independence between CTCS-2 and CBTC ground equipment to the greatest extent, thereby achieving safe and efficient cross-system operation between CTCS-2 and CBTC.