It’s exactly what it sounds like: a workcart loaded with precious cargo starts randomly traversing the rail system! It’s up to the players to defeat the Scientists and take control of the loot before the Cargo Train self-destructs. Randomized loot may include Bradley-, Heli-, Elite and Locked Crates by default.
Shoot the train driver to stop the train from going any further. One most maps, this will spawn on the surface and underground.