1. Seems to be unpacked for me.
2. Railings are usually func_illusionary with player clips of the same size around them so you could shoot through them comfortably.
3. Imo, the railings in general are looking very werid from the top view, maybe you can add a small stripe on top of them? Maybe the same texture as you are using at corners where two railings stick together (see prev. screenshot)?
4. Trains do not kill you on the impact, only if they smash you to the wall. Usually trains that go that fast will kick your ass instantly.
5. You can walk ontop of all the beams and stuff under the roof. Idk if that is intentional, but this can be quite annoying due to soldiers and engineers.
6. And a really tiny tweak that is just my personal opinion - add a small player clip to this area so you can stop bumping into this little thing sticking out of the wall (or move the railings so they will annoy scoped snipers less). Pardon my drawings.
Edit: 7. Looks like the map is also missing a koth HUD.