There are some epic metro lines in Turkey, Istanbul, M1 or M2 line would suit perfectly since we dont have a metro in southern EU for the game, especially the M2 line looks awesome and it is mostly underground so it will be quite easier to build, the M2 line's trains have 2 variations, the 2017 one and the 2009 one, i strongly recommend/suggest having a look at them and possibly adding it into the game, the trains are made by Hydundai, they are called "Hyundai Rotem", hope this suggestion helps, i will try to attach a 2017 and a 2009 version of the trains(there is 4 car and 8 car variants in this line, but the trains are mostly 8 carriages, honestly i never saw a 4 carriage one). .
