Advanced Civil Speed Enforcement System (ACSES) is a positive train control cab signaling system developed by PHW and Alstom. The system is designed to prevent train-to-train collisions, protect against overspeed and protect work crews with temporary speed restrictions. The information about permanent and temporary speed restrictions is transmitted to the train by transponders lying in the track, coded track circuits and digital radio. It is installed on parts of Amtrak's Northeast Corridor between Washington and Boston.
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