page_title: East West MRT line
section_title: Train control
hierarchical_section_title: East West MRT line / Train control
caption_attribution_description: English: A C151 trainset at Tanah Merah's CGL Platform.
context_page_description: The East West line is a high-capacity Mass Rapid Transit line operated by SMRT, running from Pasir Ris station in the east to Tuas Link station in the west, with an additional branch between Changi Airport and Tanah Merah stations. It is the second Mass Rapid Transit line to be built in Singapore. The 57.2 kilometres line is the longest on the MRT network, with 35 stations, 8 of which are underground. The line is coloured green on the rail map.
  Constructed and opened as part of the North South line in the early stages of development, the East West line is formed after the opening of the eastern extension to Tanah Merah in 1989. Nevertheless, till today, both lines used identical signalling equipment and rolling stock. The EWL signalling systems have been upgraded along with the NSL and is the second line to have its signalling upgraded completely, converting it from semi-automatic to fully automated operations.
context_section_description: The East West line is currently equipped with Thales SelTrac Communications-based train control (CBTC) moving block signalling system with Automatic train control (ATC) under Automatic train operation (ATO) GoA 3 (DTO). The subsystems consist of Automatic train protection (ATP) to govern train speed, NetTrac MT Automatic Train Supervision (ATS) to track and schedule trains and a Computer-based interlocking (CBI) system that prevents incorrect signal and track points to be set.
  The old signalling system has undergone decommissioning work from August 2018 and was completed on 23 November 2018.  It consists of Westinghouse fixed block signalling system with Automatic train control (ATC) under Automatic train operation (ATO) GoA 2 (STO). The subsystems consist of Automatic train protection (ATP) to govern train speed, Automatic Train Supervision (ATS) to track and schedule trains and a Relay interlocking system that prevents incorrect signal and track points to be set.
  The stretch of track between Pioneer and Tuas Link stations was equipped with the new signalling system which came into use in June 2017. As the section of track between Pioneer and Joo Koon support 'mixed-mode' of both signalling systems, trains terminating at either Joo Koon or Tuas Link would have to change signalling modes at Pioneer MRT station as trains terminating at Joo Koon would proceed to a turn back siding which was built as part of the TWE which only supports the new signalling system. Eastbound trains towards Pasir Ris would have to change back to the old signalling system at Pioneer MRT station. This procedure was removed after the train collision at Joo Koon as trains terminated at Joo Koon. The new signalling system became fully operational on 28 May 2018.
  Automatic full-height platform screen doors by Westinghouse were originally installed in all underground stations since opening, and half-height platform screen doors by ST Engineering's Electronics sector were installed by August 2011 on elevated stations. Tuas West extension stations have half-height platform screen doors by Fangda from their opening.
caption: Half-Platform Screen Doors installed in Tanah Merah station
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