Trains are just unstoppable these days. Just think about Grand Theft Auto V, or in this case, Golmud Railway in Battlefield 4. You can line up anything in front of them, they won't do anything but break the laws of physics.
I love how some of the players are just parachuting onto the moving train, like it'd change anything.
Here's the full clip — with a slightly NSFW, but mandatory Thomas the Tank Engine soundtrack:
Badgerfield 4: Thomas The Dank Engine [YouTube]