Established in 1978 and headquartered in Ankara, Turkey, Yüksel Proje Uluslararası A.Ş. is Turkey’s largest independent engineering, architectural, and project consultancy firm. Consistently ranked by Engineering News-Record (ENR) among the Top 225 International Design Firms, Yüksel Proje employs more than 1,500 multidisciplinary engineers, architects, and technical specialists with project footprints spanning more than 30 countries across Europe, the Middle East, Central Asia, South Asia, and North Africa.

Yüksel Proje covers the full spectrum of rail and transit development: technical feasibility studies, route optimization, geometric corridor design (Civil 3D, OpenRail), geotechnical modeling, deep underground station caverns, bored tunnel alignment (TBM/NATM), railway viaducts, trackbed permanent way engineering, electrification (catenary and substations), and train control systems. In addition to core detailed design, the firm serves as a premier Construction Supervision and Project Management Consultant (PMC / Owner’s Engineer).

The firm’s railway portfolio includes flagship domestic and cross-border mass transit and intercity projects. Notable milestones include detailed design and construction supervision for extensive sections of the Ankara–Istanbul High-Speed Railway, detailed engineering for Istanbul Metro lines (including the automated M5 Üsküdar–Çekmeköy Line, M7 Kabataş–Mahmutbey Line, and M12 Göztepe–Ümraniye Line), rail design on the Rail Baltica corridor in Europe, the Rishikesh–Karanprayag Railway and Kolkata Metro in India, and urban light rail and transit networks across Algeria, Romania, and Bosnia & Herzegovina.