A train monitoring and reporting system in which each car of a multi-car train is provided with sensors to monitor brake, door, motor and other functions. A controller in each car sequentially and repetitively reviews the condition of each sensed function and evaluates the conditions to determine whether...http://www.google.de/patents/US4041470?utm_source=gb-gplus-sharePatent US4041470 - Fault monitoring and reporting system for trains
