text: CBTC Technology At the end of 2012, L&T Metro Rail awarded Thales a 7.4 billion ($US 134m) contract to provide CBTC and integrated telecommunications and supervision systems on all three lines. Thales Group supplied its SelTrac Communications-based train control (CBTC) technology, and trains initially run in automatic train operation mode with minimum headways of 90 seconds, although the system will support eventual migration to unattended train operation (UTO).
  Rolling stock
  On 12 September 2012, Larsen and Toubro Metro Rail Hyderabad Ltd (LTMRHL) announced that it has awarded tender for supply of rolling stock to Hyundai Rotem. The  tender is for 57 trains consisting of 171 cars which will be delivered in phases at least 9 months before the commencement of each stage. On 2 October 2013, LTMRHL unveiled its train car for Hyderabad Metro. A model coach which is half the size of the actual coach, was on public display at Necklace Road on the banks of Hussain Sagar in the heart of Hyderabad. The trains will be 3.2m wide and 4m high. There will be 4 doors on each side of each coach.
  On 10 April 2014, the first metro train for HMR rolled out of Hyundai Rotem factory at Changwon in South Korea and reached Hyderabad in May 2014. On 31 December 2014, Hyderabad Metro Rail successfully conducted a training run in Automatic Train Operation (ATO) mode for the first time between Nagole and Mettuguda. In February 2022, Hyderabad Metro became India's first metro rail to introduce ozone-based sanitisation of its train coaches. Hyderabad Metro rakes regenerate power using the regenerative braking system.