The Marmaray is the suburban train system in Istanbul and connects neighborhoods on the European and Asian side with ease of transport and connection.
Marmaray schedules operate at 15-minute intervals between Halkalı (Europe) - Gebze (Asia).
The Marmaray has a fare system that is based on how many stations you travel to/from, but that only applies if you have a Turkish personalized IstanbulKart. Tourists do not get the benefit of the segment pricing and any trip on the Marmaray is charged the full amount of Marmaray of TL 39.17 (about $US1.25).
The trains are modern and they looks like a normal subway train. read more