Fail-Safe on-Board Databus for Automatic Train Protection
Hubert Kirrmann, Bernhard Eschermann, D Forsgran · Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit · 1995
The Eurocab project defines an automatic train protection (ATP) architecture which supports different signalling systems. To this purpose, ATP devices on-board a locomotive are connected by a serial databus. Due to the real-time requirements, this bus has to guarantee fast and deterministic response times. Due to safety requirements, this bus has to provide a high data integrity. Since the bus is not considered able to be trusted, safety applications have to implement a safe user layer on top of the usual bus protocols.