I got the feeling that the trains are too tall. Also jumping down from the 'eagles nest', or whatever you wanna call that classic camping spot outside, to a train doesn't do falldamage (trains are too tall?). Also it would be fun to be able to jump on the trains by bouncing off a wall or something (*cough*too tall*cough*)
Seems that the map favors pretty heavily the blue team. I think the most unbalanced spot in the map is the stairs inside near the ladder. The new door you have added puts every red team member who try to get to the stairs to a crossfire. Also it's pretty annoying that the blue team can basically shoot from the end of the whole hallway thing to end of the first stairs you run up as a red (the first stairs can also become quiiite annoying chokepoint if blue manages to push that far).
On a sidenote; this is maybe the only map where I would like to have smokes enabled hmmm...
I can also take some screenshots tomorrow if the things I said above did not make any sense