INRAIL Railway Tender Rules Changed as 240 Billion Lira Project Advances
Eligibility rules for the Istanbul North Railway Passage project have been relaxed, allowing firms to combine up to three contracts to prove experience.

KEY POINTS
- Annexes 3 and 4 of the INRAIL tender were published on November 6, 2026
- The project is valued at approximately 240 billion Turkish liras
- Contractors can now prove experience using up to three separate contracts
- The first section is 28.49 kilometers long
- Construction is targeted to finish by the end of 2030
The Infrastructure Investments General Directorate issued annexes 3 and 4 for the international construction tender of the Istanbul North Railway Passage project on November 6, 2026.
The project, valued at approximately 240 billion Turkish liras, will run from Cayirova in Kocaeli to Catalca in Istanbul.
“The contract condition has been loosened! Companies now have the opportunity of three separate contracts.”
Twenty-seven companies, including Cengiz, Limak, Kalyon, Kolin, Yapı Merkezi, and Metgun, had previously expressed interest in the tender.
Under the new rules, contractors may document required railway design, tunnel, bridge, and viaduct experience across up to three separate contracts instead of a single one.
The first 28.49-kilometer section will run from Cayirova Station via Sabiha Gokcen Airport to Kurtkoy.
The environmental impact report was prepared in June and submitted to the ministry, with the review commission meeting held on September 17.
Construction is targeted for completion by the end of 2030, and the Asian Development Bank has approved a 750 million dollar loan for the 127-kilometer line.
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