A flaw with the the ending...something that hasn't been brought up...
Whenever Dan raps on the train door and it gets opened up by some kind of marshall, Dan tells him that he's got a prisoner and then the marshall dissapears.
Not even when the gang rides up or when Dan's son has his gun on Wade after Dan dies does the marshall make an appearance.
That, to me, was the only thing wrong with the end. I would think that anybody that transported prisoners would not be a complete coward.
"I stick my neck out for nobody."- Rick Blaine, Casablanca