What a terrible ending!
So as Edward Norton just creeps up on them strolling away from their train cart full of Gold, he decides that rather than shooting them all in the back, he should instead bribe what he thinks is the train official to get inside one of the cars.
Whoops! Turns out Marky Mark has set him up to be captured by the Ukrainians, and after a brief, witty exchange between the whole gang (reminiscing the ending of a Scooby Doo episode after they gather around the bad guy/monster who's in time to say "You Darn Kids!"), the Mafia thugs drag Norton off to his fate.
"Please, I'll pay you double whatever they're giving you, just don't shoot me!"
"Oh we're not going to shoot you. We have many machines in store that we think you might enjoy."
Then Norton pulls the biggest 'I've been suckered' face, as the gangsters carry him away to be fed into a sausage grinder.
BA DUM TISH!
Cut to the next scene where the rest of the team are congratulating themselves over champagne.
It's the PG-13 rating's idea of a happy ending, but with an unsavoury morbid twist that just gives the entire affair a sour taste.