You should copy/paste the "skip" shader and rename it to "hint_skip" then find/replace skip with hint_skip. you will then be able to filter hints with ctrl + H rather than filtering translucent.
Quite a few of your hallways are a bit tall, you should try reduce a few of them or maybe add in a LOT more trim, upper and lower trims so that the walls don't seem so "spacey"
The metal fence by the ticket booth should be nonsolid but player clipped instead of being solid.
Not sure I like the blue metal texture, seems weird and doesn't fit.
The head height ledge in the arrivals section should be clipped so its rectangular so you can grab on the ledge.
I'm thinking with the glass at the cafe, you should make each individual plane a func_breakable, but set bombable to 1 and the type to glass. that way you can shoot through it but it wont break. I seem to hate glass which you cant shoot through
Make sure you don't select all of them and make them a func_breakable together, just do it manually for each individual plane.
Other than that, I think the layout is great. The spawns might need to be spread out, cause they only seem to have 1 exit each.
on the note of spawns you should have 16 spawns for each team