Technical details
Client
TCDD
Dates

2012-2019

Missions
Preliminary Design, Detailed Design
Location
Türkiye
Activity
High Speed Railway

The Adapazari–Istanbul Northern Pass project involved comprehensive engineering and survey work for the design of a 111.6 km dual-line high-speed railway (350 km/h) between Köseköy (İzmit) and Yavuz Sultan Selim Bridge. Key services included alternative corridor studies, cost estimation, feasibility assessments, hydraulic and drainage planning, topographic and geotechnical surveys, geological modelling, and preparation of detailed design and alignment profiles. The project also featured application designs for 14 viaducts totaling 3,839 m in a high seismic zone.

Key Figures

  • 111 km long HSR
  • 350 km/h design speed
  • 14 viaducts
  • 28 tunnels
  • 8 cut&covers
  • 7 underpasses
  • 5 overpasses
  • 55 culverts
  • 27 road connections