The upgrade is part of the Başkentray project, which involves the renovation of the signalling systems for high-speed, conventional and suburban services in the Turkish capital. The Gülermark-Kolin joint venture is completing the project for Turkish State Railways (TCDD).

The project comprises a centralised traffic control system, electronic interlockings, ETCS Level 1 and two automatic train protection systems, trackside signalling equipment, and interfaces between high-speed lines, conventional lines and level crossings.