The objective of the map should be to derail the train while it comes into the station.
Come on man, wouldn't be great? Demoman on the tracks, down to the wire... he's trying to get that detpack on a track... train's horn goes off... and then the only thing left is an empty grenade launcher and a boot. With a foot still in it.
But yeah, try for something like that.
If you want to be a bastard, you could call it ff_mantrain. That would be a great joke. "Oh guys, I love Man Train!"