Completed project · 2016-2017
Suduragi-Ayranci high-speed railway section, part of the Karaman-Ulukisla line
Construction of 23 route-km of double-track high-speed railway (approximately 46 track-km, design speed >250 km/h) on the Suduragi-Ayranci section, including 1.2 km of NATM tunnel, three viaducts and bridges, four underpasses and five overpasses.
The Karaman-Ulukisla line is part of a wider approximately 135 km double-track high-speed rail corridor designed for speeds above 250 km/h. Gokbilge's scope on the Suduragi-Ayranci section covered 23 route-km of double-track railway infrastructure and superstructure (approximately 46 track-km), including 1.2 km of tunnel works executed using the New Austrian Tunnelling Method (NATM).
Status reported at the end of Gokbilge's contracted scope (2017): the first line was finished and awaiting test clearance before traffic could be diverted from the existing line, after which disassembly and excavation would begin on the second line. A geological fault fracture encountered during later tunnel segments had delayed the phase 2 works. Status beyond 2017 has not been independently verified for this page.
- 23 route-km of double-track railway (approximately 46 track-km); first line completed
- 1.2 km NATM tunnel, three viaducts, nine grade-separated crossings
- Track testing coordination ahead of traffic diversion to the new line