Signaling System Retrofit and Reverse-connection Scheme for Shanghai Rail Transit Line 13 Beidi Road Depot

Abstract

Objective Beidi Road Depot of Shanghai Rail Transit Line 13 is undergoing an upgrade from a conventional interlocking system to CBTC (communication-based train control) system. This upgrade is characterized by a short nighttime commissioning period, numerous reverse-connection equipment, and stringent safety requirements. To meet the demands of signaling system retrofit and commissioning, it is essential to explore a suitable reverse-connecting scheme. Method A detailed reverse-connection scheme for signal machine, axle counter device, turnout switch machine, and communication network equipment is provided, focusing on the reverse-connection processes for reusable turnout switch machines on existing lines, indoor communication network devices, and trackside wireless access points. Result & Conclusion During non-commissioning periods, all newly added train and shunting signal machines and axle counter devices must be powered down. The railway signal AX series relays are used as a reversing device for large DC turnouts. SDH (synchronous digital hierarchy) equipment cannot be removed directly. The newly installed industrial Ethernet switch machine can only be integrated as a subnet device into the backbone network, maintaining its connection until the completion of the SDH network retrofit. And then the industrial Ethernet switch machines are connected to the retrofitted mainline communication network. The existing trackside AP (access point) devices can be connected in batches with the new signal rooms to avoid a complete simultaneous cutover, thus reducing construction difficulty and risk.

Keywords

• urban rail transit
• signaling system retrofit
• signaling system reverse-connection
• equipment commissioning