page_title: Delhi Metro
section_title: Signalling and telecommunication
hierarchical_section_title: Delhi Metro / Signalling and telecommunication
caption_attribution_description: Inside a Metro coach.
context_page_description: The Delhi Metro is a rapid transit system serving Delhi and its satellite cities of Ghaziabad, Faridabad, Gurgaon, Noida, Bahadurgarh and Ballabhgarh, in the National Capital Region of India.
  It is by far the largest and busiest metro in India, and second oldest after the Kolkata Metro. The network consists of Eleven colour-coded regular lines serving 285 stations with a total length of 389 kilometres.
  The system has a mix of underground, at-grade, and elevated stations using both broad-gauge and standard-gauge.
  Delhi Metro operates over 2,700 trips daily, starting at around 05:00 and ending at 23:30.
  Construction started in 1998, and the first elevated section on the Red Line opened on 25 December 2002. The first underground section on the Yellow Line opened on 20 December 2004.
  The development of the network was divided into phases. Phase I with 3 lines was completed by 2006, and Phase II in 2011. As of March 2020, Phase III is in the finishing stage and scheduled to be mostly complete by the end of the year. Construction on Phase IV was formally started on 30 December 2019. In 2010 Delhi Metro completed 10 years of operation, which was a major milestone to achieve.
context_section_description: The Delhi Metro uses cab signalling along with a centralised automatic train control system consisting of automatic operation, protection and signalling modules. A 380 MHz digital trunked TETRA radio communication system from Motorola Solutions is used on all lines to carry both voice and data information. For Blue Line Siemens Transportation Systems has supplied the electronic interlocking Sicas, the operation control system Vicos OC 500 and the automation control system LZB 700 M. An integrated system comprising optical fibre cable, on-train radio, CCTV, and a centralised clock and public address system is used for telecommunication during train operations as well as emergencies. For Red and Yellow lines ALSTOM has supplied signalling system and for Green and Violet lines, Bombardier Transportation has supplied CITYFLO 350 signalling system.
  The Airport Express line has introduced WiFi services at all stations along the route on 13 January 2012. Connectivity inside metro trains travelling on the route is expected in the future. The WiFi service is provided by YOU Broadband and Cable India Limited. In August 2017, Wifi service was launched at all the 50 stations under Blue Line.
  A fully automated, operator-less train system has been offered to Delhi Metro by the French defence and civilian technologies major Thales.
caption: Inside a Mitsubishi Corporation coach.
exif: {}