In Istanbul there are different names for the several means of transport on rails. I here use one term for them all. I remember the first time I could travel from the airport to Aksaray station, what a joy. But the system is growing at a fast rate, and is projected to grow much, much larger than the current one. During a 2014 visit I used the system a lot, and took some pictures at a number of stations and in some cases the streets nearby.
There were two major developments: a bridge across the Golden Horn now shortens travel time from the southern part of town to the northern one (both on the European side), and a tunnel now connects Europe and Asia, in about four minutes you make that “crossing” on what’s called Marmaray.
One is working hard on connections from the new airport to the heart of town. In 2023 I saw impressive new lines, but that connection is not yet ready.

I intend to add some pictures from earlier visits. I tried identifying the location, in some cases I don’t remember (and gps does not work underground). So I also show some of the (often amazing) tiles panels and similar ornamentation of the stations.