Demonstrating signalling compatibility between two train control systems

This paper deals with the issue of demonstrating electromagnetic and signalling compatibility between two train control systems. In particular, the paper presents an analysis of mutual coupling between a legacy track circuit based train control system (TCS) and a transmission based train control (TBTC) system. The analysis focuses on the ability of the TBTC system to adversely impact the operation of the track circuit based TCS. The paper presents measurement and computational data, and concludes that due to the weak coupling between the TBTC and track circuit TCS, the induced voltage (and current) in the legacy system due to the TBTC does not present a EMI risk to the safe operation of the track circuit TCS.