This is a multi path payload version of Valve's 2Fort.

If you want to change the cart's path, then just shoot the track switch before the cart reaches the fork in the track. Both alternate tracks will go through one or the other sewer at some point, but only one path will take the cart over the bridge. 

In Blu's initial spawn area, there is a model train to practice changing the track path.

Red Start off in the Red Fort, but will respawn in the Blu Fort. Red will always spawn ahead of the cart, Blu will always be behind.

The saw blade is insta-death if it touches you, and can be activated by shooting it. It will reset after about 30 seconds.

Hope you enjoy it!