Advanced Civil Speed Enforcement System

Amtrak ACSES cab display unit combines a cab signal display with track speed enforcement. Lack of a second speed limit below signal speed indicates ACSES is not in service.

Advanced Civil Speed Enforcement System (ACSES) is a positive train control cab signaling system developed by Alstom.[1] 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 (Balises) lying in the track, coded track circuits and digital radio.[1] It was installed beginning in 2000 on all of Amtrak's Northeast Corridor (except MTA territory) between Washington and Boston, and has been fully active since December 2015,[2] a few months after the 2015 Philadelphia train derailment which it would have prevented.[2]

  1. ^ a b "Advanced Civil Speed Enforcement System (ACSES)". AlstomSignalingSolutions.com. Alstom. 2003. Archived from the original on 2017-01-03. Retrieved 2016-12-20.
  2. ^ a b Vantuono, William C. (2015-12-22). "ACSES fully operational on the NEC". Archived from the original on 2018-11-07.