This is TheBoomBox, which takes place in an abandoned train station over run by war among armies of two countries.
Two goods trains carrying Valuable supply on either side fuels soldiers to cease power and win against the opposing force trying to do the same.
1) Rushing the edges of the map can let you reach the other side of the map quicker, but is much more dangerous and open compared to going from the middle and taking cover from trains and other obstacles.
2) Hidden jump pads are present in a few compartments of the passenger trains which have an opening to peak enemies by surprise and get on top of the trains.
3) Crouching behind seats completely hides the player providing time to reload in an active gunfight.
4) Lastly, have fun!
P.S., This is a Lite version of this map, I also have a more detailed version that's bigger but can't upload it currently. I might upload it if the maximum allowed file size for a map is increased. Thanks for downloading