contract," Tunnelling and Underground Space Technology 20: 612–16. Istanbul Technical University Marmaray Laboratory web site. Tunnelbuilder technical description. Marmaray BC1 project and surveying works BBC article on the project. 2013 establishments in Turkey Fatih Underground commuter rail Üsküdar Binali Yıldırım Rail transport in Istanbul Turkish State Railways Railway lines opened in 2013 Railway lines opened in 2019 Buildings and structures in Istanbul Buildings and structures in Kocaeli Province Transport in Kocaeli Province