Système d'aide à la conduite, à l'exploitation et à la maintenance

The Système d'aide à la conduite, à l'exploitation et à la maintenance (SACEM) is an embedded, automatic speed train protection system for rapid transit railways. The name means "Driver Assistance, Operation, and Maintenance System".

SACEM cab signalling (far left) on the MI 09, showing a speed limit of 100 km/h (62 mph)
Lineside signal on RER A taken over by SACEM, as indicated by a St. Andrew's Cross (⨯)

It was developed in France by GEC-Alsthom, Matra (now part of Siemens Mobility) and CSEE (now part of Hitachi Rail STS) in the 1980s. It was first deployed on the RER A suburban railway in Paris in 1989.

Afterwards it was installed:

In 2017 the SACEM system in Paris was enhanced with Automatic Train Operation (ATO) and was put in full operation at the end of 2018.[4]

The SACEM system in Paris is to be enhanced to a fully fledged CBTC system named NExTEO. First to be deployed on the new prolongated line RER E in 2024, it is proposed to replace signalling and control on all RER lines.[5]

Operation
SACEM cab signalling on the MI 2N Altéo in "Jog Mode", showing a speed limit of 30 km/h (19 mph)

The SACEM system enable a train to receive signals from devices under the tracks.[6] A receiver in the train cabin interprets the signal, and sends data to the console so the driver can see it. A light on the console indicates the speed control setting: an orange light means "Jog Mode", or 30 km/h (19 mph); a red light means full stop. If the driver alters the speed, a warning buzzer may sound. If the system determines that the speed might be unsafe, and the driver does not change it within a few seconds, SACEM engages the emergency brake. SACEM also allows for a reduction in potential train bunching and easier recovery from delays, therefore safely increasing operating frequencies as much as possible especially during rush hour.

References
  1. Wong, Marcus (2011-04-12). "Railway signalling on the MTR underground". Checkerboard Hill, Private blog. Retrieved 2017-12-23.
  2. "Mexico City (Mexico) Lines A, B and 8 - SACEM high performance Automatic Train Control for driver-based operation" (PDF; 600 kB). Siemens SAS; Infrastructure & Cities Sector; Mobility and Logistics Division. 2015-03-05. Retrieved 2017-12-23.
  3. 张郁; 黄佩伟 (2004). "上海轨道交通3号线轨道电路分析" [An analysis of track circuits deployed on Shanghai Metro Line 3] (in Chinese). 城市轨道交通研究. Retrieved 2020-05-12.
  4. "Alstom-developed Automatic Train Operation system successfully enters service on the RER A". ALSTOM Holdings. 2017-10-05. Retrieved 2017-12-23.
  5. "RER E – soon one train ahead thanks to NExTEO …". SNCF Réseau. 2017-07-20. Retrieved 2017-12-23.
  6. "Système d'Aide à la Conduite, à l'Exploitation et à la Maintenance". Institution of Railway Signal Engineers. 2003. Retrieved 2017-12-23.


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