
Continuity mistake: When Dewey and Gilleece are in the rail roller truck, the tailgate of the truck is clean with nothing on it. After the attempt to climb on 777 fails and the door gets smashed off, the tailgate suddenly has some kind of equipment either attached to or exposed off the tailgate in the middle.
Suggested correction: Not necessarily. Some engines may not have a rear cab access (like Frank/Will's engine had). And even if the rescue engine did have a rear cab access 777's engine only had a side access stair which at the speed it was going is more difficult to climb over from the engine in front of it.
Actually 777's catwalk goes across the front, from side stair to side stair, but someone would have to leap over a rail or a chain to get onto it from the other engine. Why would there be stairs on the right side unless there was a catwalk to get to the door on the left side?