I always enjoyed the idea of helltrain and I'm glad you gave it another shot. This map is overall pretty great and much improved in my opinion. Still, I've got some feedback for ya so here ya go.
-I'm not sure what all can be done about this but while the moving skybox is impressive, it's textures are very crispy. Maybe try to up the resolution or something?
-These props only really work on a black background due to being fully black themselves. Diva Dan's released some assets from koth_slaughter_event that may work as a good replacement
-this cabinet looks fantastic
-clip the doorway smooth
-either remove collision on these panels or clip them smooth
-this angled roof makes walking under it kind of funky. If you're too far on the right you can bump the ceiling. maybe raise it up a tad if you can?
-These doorways feel too small
-Love how this looks like the castle from monsterbash
not sure why these resapawnroom visualizer textures are here. They look out of place and whatever they are meant to do can probably be done a different way
-the teleporter exit for this vent knocks you around in an odd way opposed to the other vents\
-jumping up these stairs is horrid. Perhaps replace it with a jump pad up to the higher level?
-again, clip or remove collision
-is that an image of balloon race? Why? It looks odd to have a screenshot of that map with it's basic detailing since it doesn't look like a real place. Maybe see if you can find someone to do a fancy paintover of it to make it feel more like an image of a place than a screenshot
-I'm not sure about having the flag and capture zone it 2 different areas. I understand why you did this so that players don't have to go all the way through the train to capture the flag but I imagine it will confuse players since they are so used to going back to the flag to score.
-getting on this roof is kinda wonky. Not sure what can be done about it but something to smooth it out and make it less awkward would be good
-are both of these lights supposed to be on at the same time? I like how they turn on and off based on score but it looks like Not OK is for 2 points and Danger is for 3 when the boiler explodes opposed to both at the same time.
-This spawn exit is right in the flag room and kind of awkward in itself. I'd suggest pushing it back some.
