The Istanbul Metro is a rapid transit railway network that serves the city of Istanbul, Turkey. Apart from the M11 line, which is operated by TCDD Taşımacılık, the system is operated by Metro Istanbul
Two trains waiting at Boğaziçi Üniversitesi on the M6 line
Karaköy station of the Tünel, which entered service on 17 January 1875
The Golden Horn Metro Bridge entered service in 2014.