Marmaray
Marmaray (pronounced [ˈmaɾmaɾaj] ) or B1 (Halkalı – Gebze) Commuter Train is a 76.6-kilometre-long (47.6 mi) commuter rail line located in Istanbul, Turkey. The line runs from Halkalı, on the European side, to Gebze, on the Asian side, along the north shore of the Sea of Marmara.