Hey sorry for the late feedback...I guess it wasn't a day, but here it is anyways. :P
Fun: This is a fairly fun map to play on. Players have to jump from train to train to reach each other, adding an element to the game that most maps don't really have. Every time I play this map it reminds me of a thing my friends say: "The ground is now lava" since if you touch the ground you'll most likely die.

Gameplay: I noticed the gameplay of this map is very nice. Players seem to have a good time jumping around and stabbing each other (like a bunch of inmates, LOL.) I noticed that the map has a little trouble with flow though, as players seem to have a bit of trouble getting around. Moving from the back of the map where player spawn is simple (there's plenty of ladders, etc) but moving from the trains towards the back of the map, it is much more difficult. Lets just hope everyone dies before they decide to return to the back of the train.
Teamplay: Very nice teamplay for this map, as if players don't work together they usually get gang-banged and shanked to death. I did notice that if you are playing against bots that they tend to suicide (lol bots don't know that falling off a train means death.)
Looks: A very clean looking map, with some nice textures and the like. The map is pretty well optimized, meaning it isn't hard on the FPS. I noticed that the box-car second to the right has a cute little TV and couch in it, giving a slightly more humorous side to the map.
Creativity: This map is very creative and very original. I've only played one map that is similar to this one, and that is ctf_convoy for Unreal Tournament.

A great map, definitely one of the better knifing maps. This map is fairly simple, meaning that it is easy to get downloaded and get into the action. I did notice, however, that some aspects were lacking. Some of the props were pushy (knocking me off the trains usually) and the texture for the skybox seems to skip around a bit.
y i laggin?