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Information regarding temporary speed restrictions is given to the train while en route via a wireless data system.

Temporary speed restrictions apply to all other conditions not covered by the permanent timetable, including track defects, lineside hazards and maintenance workers in and around the track area.ĭata regarding permanent speed restrictions and other information about the permanent way and track configuration is obtained in chunks from the track mounted transponders and stored in an onboard database.

Permanent speed restrictions are those that represent maximum safe speed for track geometry and other conditions as laid out in the employee timetable.

There are two kinds of speed restrictions which are enforced by the system: If the train exceeds the safe braking curve then the brakes are automatically applied. The on-board components keep track of a train's position and continuously calculates a maximum safe braking curve for upcoming speed restrictions. General system design ĪCSES provides railway trains with positive enforcement of "civil" speed restrictions (those based on the physical characteristics of the line). 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, a few months after the 2015 Philadelphia train derailment which it would have prevented. 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. The system is designed to prevent train-to-train collisions, protect against overspeed, and protect work crews with temporary speed restrictions. Lack of a second speed limit below signal speed indicates ACSES is not in service.Īdvanced Civil Speed Enforcement System ( ACSES) is a positive train control cab signaling system developed by Alstom.

JSTOR ( December 2016) ( Learn how and when to remove this template message)Īmtrak ACSES cab display unit combines a cab signal display with track speed enforcement.

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