I've only had the opportunity to play two full rounds, but this map is great!
The moving flatbed mechanic works well and leads to close, exciting games. All classes serve a role (open lanes for snipers, close quarters for pyro / heavy, numerous useful sentry locations, flanking routes for scout / spy, and naturally soldier / demo / medic work on all maps). There are a lot of unique route choices, so the map seems "strategy rich," if that makes sense.
In both rounds, the winning team took advantage of flanking via the farmost staircase to access the enemy battlements.
My only criticism is that the map feels a bit cramped outside. If I could suggest anything, it would be to find a way to open up the area between the bases and mid, especially near the train tunnel. No structures are necessary, just some extra running room.