Just one more thought on the "circus Train" In a movie from 1952 Called "The Greatest Show on Earth", The circus train is a big part of the movie. In the movie, the circus train runs in two parts, and someone attempts to rob the train of it's box office money. What they do is put a fussee on the tracks, and when the train stops, they knock out the brakeman, who was going back to flag, and protect the train from the following train. The resulting wreck is spectacular, and one of the best ever filmed. It was obviously done with models, but it is well done anyway. Whoever filmed this did their homework, because when the train stops, the engineer gives the proper engine whistle for "flagman protect rear of train." Check it out, it is a typical 50's corny movie, but it works and in fact as an all star cast. Betty Hutton, Dorothy Lamour, Charlton Heston, Jimmy Stewart. It was directed by Cecil B. DeMille, and it won The oscar for best picture. Another interesting scene is when they use an Elephant to lift heavy debris off of one of the injured. Check out the train itself and compare it with todays circus train..it has not changed much in 53 years.