This metro line is a old-ish metro line and also a quite big line, it is a very heavily used line with its both viaduct, overground and underground stations, the trains were made in 1988, 1989, 1990 by ABB, they are still working nowadays with a few upgrades. This big line would be a great addition the TSW3, because no one ever made it. I will upload a photo of the route down below, the metro splits in 2 lines from the station "Otogar", M1A part of the line goes to the Atatürk Airport, and the M1B line is a newer line that is shorter than the M1A line, the M1B line goes all the way to Bağcılar - Kirazlı.
