Created with the Payload Checklist Contest in mind, BLU needs to capture the first two carts before moving to the third! This is single stage.
The hud is somewhat janky, there is only one line, and is updated based on which cart was touched last. Other than that, it works mostly fine.
First two carts have an optional door that they recede into once captured. First two carts also do not rollback on their own, change this in their train watcher if you desire to.
Blade x64 for development help.
A Boojum Snark for the base payload prefab used.