page_title: Système d'aide à la conduite, à l'exploitation et à la maintenance
hierarchical_section_title: Système d'aide à la conduite, à l'exploitation et à la maintenance
caption_attribution_description: Français&#160;: Tableau de bord d'un MI 09 du RER A, avec le SACEM en fonctionnement.
context_page_description: The Système d'aide à la conduite, à l'exploitation et à la maintenance is an embedded, automatic speed train protection system for rapid transit railways. The name means "Driver Assistance, Operation, and Maintenance System".
  It was developed in France by GEC-Alsthom, Matra and CSEE in the 1980s. It was first deployed on the RER A suburban railway in Paris in 1989.
  Afterwards it was installed:
  on the Santiago Metro in Santiago, Chile;
  on some of the MTR lines in Hong Kong, all enhanced with ATO,
  on Lines A, B and 8 of the Mexico City Metro lines in Mexico City; and
  on Shanghai Metro Line 3.
  In 2017 the SACEM system in Paris was enhanced with Automatic Train Operation and was put in full operation at the end of 2018.
  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.
context_section_description: 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".
  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:
  on the Santiago Metro in Santiago, Chile;
  on some of the MTR lines in Hong Kong (such as the Airport Express and Tung Chung line), all enhanced with ATO,
  on Lines A, B and 8 of the Mexico City Metro lines in Mexico City; and
  on Shanghai Metro Line 3.
  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.
  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.
caption: SACEM cab signalling (far left) on the MI 09, showing a speed limit of 100 km/h (62 mph)
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