As the Tekfen Engineering Rail Systems Team, we attended the opening ceremony of the first stage of the Çekmeköy-Sancaktepe-Sultanbeyli Metro Line, for which we were responsible for the design.Tekfen Engineering, which provided consultancy to Doğuş Construction for the detailed architectural, structural, mechanical, and electrical design of the 18 km metro line, contributed significantly to the project by implementing a BIM-focused design approach and leveraging advanced technologies. This approach delivered substantial time and cost savings throughout the project's ongoing activities on site.