The consortium, which is led by Thales, will be responsible for replacing MTR's existing Automatic Train Supervision (ATS), interlocking, and Automatic Train Control (ATC).

Thales will supply its SelTrac CBTC system for the project, which covers the Tseun Wan Line, Island Line (including the West Island Line extension), Kwun Tong Line, Tseung Kwan O Line, Airport Express Link, Tung Chun Line, and Disneyland Resort Line. Alstom will be responsible for project management and will also supply remote trackside equipment controllers.

In 2013 MTR awarded Thales a contract to supply CBTC for the new Shatin - Central Link, which includes modernisation of existing CBTC systems on the West Rail and Ma On Shan lines.