Marmaray Project, which is one of the most important projects in the world, is a project that does not pollute the environment by using high-capacity electrical energy in order to sustain Istanbul's urban life in a healthy way, to provide urban residents with a modern city life and urban transportation facilities, and to preserve the city's natural historical features.

Istanbul is a city that needs to be protected with historical and cultural values, on the other hand, to reduce the environmental impact of public transportation systems and to establish modern railway facilities to increase the capacity, reliability and comfort of railway systems.

The project is located on the European side Halkalı is based on the construction of the railway subway system and the upgrading of the suburban rail system in Istanbul in order to connect the Gebze districts on the Asian side with a continuous, modern and high capacity suburban rail system.

Railway lines on both sides of the Bosphorus will be connected by a rail tunnel connection that will pass under the Bosphorus. The line will go underground in Kazlıçeşme; it will travel along Yenikapı and Sirkeci, which are new underground stations, pass under the Bosphorus, and connect to Üsküdar, another new underground station, and surface again in Söğütlüçeşme.

World's Largest Infrastructure Project

The project is currently one of the largest transport infrastructure projects in the world. The entire new and improved railway system will be approximately 76 km long. Main structures and systems, immersed tube tunnel, drilling tunnels, open-close tunnels, level structures, 3 new underground station, 36 aboveground station (renovation and improvement), operating control center, pitches, workshops, maintenance facilities, to be built on the ground new A third line will consist of 4 parts, including the upgrade of existing lines, completely new electrical and mechanical systems and modern rail vehicles to be supplied. A separate contract is made for each section;

1. Engineering and Consulting Services (in force)
2. BC1 Railway Bosphorus Tube Crossing Construction
3. CR3 Gebze-Halkalı Improvement of Commuter Lines, Construction, Electrical and Mechanical Systems (In the Tender Process)
4. Supply of CR2 Railway Vehicles (in force)