i remember when i first saw this movie . i be laugh so hard and i nearly cry . i really love the scene where the union spy drop the wood down at him and when he look up . one of the spy point out that represent there only one man in that engine . how stupid they be . i think it be amaze how he do all of those stunt . because they do not have the technology back then to edit it like it be something else . the scene be the train fell into the river after the bridge collapse and be perhaps the most expensive and difficult part of the movie to film . and if you notice the look on the face of the union officer when the camera cut to them and those be for real and because they be not tell what be go to happen to that train . so bravo buster keaton . positive .