So who killed who? (Spoilers to follow)
One of the things I found unconventional about this film is that we never know exactly who was culpable for which action? Are we to assume that Banlon, Pearce, Henry, Carlos, O'Brien, or Fairchild struck the doctor then murdered him? Or that one of them sawed the coupling off of the troop cars?
We known Banlon was responsible for Jackson's plunge to the bottom of the bridge, but we never are fully given flashbacks, or told directly, which, I guess keeps the tension up, but the lack of closure is very unconventional.
Perhaps the book version sheds light on this?