“…Currently, due to development of power electronics [3], automation and digital control, electric motors in electric traction can be supplied from various energy sources, and the choice of specific solution depends on the purpose of service (required traction characteristic), costs, efficiency, as well as reliability, availability, maintainability and safety (RAMS). This is accompanied by new methods of analysis [4], diagnostics and provision of redundancy in the subsystems, especially the braking ones. Modern electric traction vehicles are complex engineering systems equipped with high-end solutions in electromechanics, electronics, automation and IT, especially in high-speed railways which have achieved record speeds of up to 574 km/h in France (AGV in 2008), with trains in China travelling at 380 km/h in regular service.…”