I spent 45 minutes each days in this metro during 3 years. And day after days I discovered a really pleasant design. So one day I decided to model it !
I used mid poly modeling technique and a Detail albedo texture to add some details. The shader is available here : https://gumroad.com/l/ocMrs
Only two sets of 2048 textures are in use, one for whole inside body, a second one for the details like stickers.
The video shows the animation of the railcars.
I hope you enjoy !