 The director only had one chance to crash the train in the train  scene and had to get it right, so he consulted an array of  engineers, stunt doubles, the insurance company, to try to ascertain  exactly what would happen, the train was expected to crash into his  bus at a speed of 35 miles per hour, but the director was in error,  the train came at a speed of 42 miles per hour. Nevertheless, the  scene still went exactly as planned.