Continuity mistake: When the fireman falls from the engine passing over the deep gorge we hear him screaming. John Deakin examines the body and later explains that due to the lack of bleeding the man was already dead before he fell. (He theorizes he was killed and then pushed from the engine because he had discovered the 2 bodies of the missing officers in the woodpile).
Continuity mistake: When John Deakin discovers the Reverend's body in the coffin, the Reverend's eyes are closed in one shot and open in the next.
Continuity mistake: The caboose and troop cars were decoupled. Later, after Rev. Peabody disappears, the train is shown chugging along with all the cars. (00:55:00)
Answer: Ben Johnson and Charles During. Their characters had guns pointed at them, they stopped the train suddenly to knock them off balance. As soon as Bronson and the Major jumped off the train, Johnson and During took control of the engine.