It is basically Speeding Train, only stopped, and at a later time during the day, as evidenced by the darkness of the map.
Even though the train is stopped, falling off will still kill you.
This map has several walls that one can take advantage of. Near the walls, there is a health powerup, making it easy to win on this map by camping in the two train carts and grabbing the health powerups whenever they appear. The player can secure him at the front of the train, since AI's cannot reach here (unless if a grenade launcher's grenades or homing missiles shots over here).