I thoroughly enjoyed that video. I loved hearing the different whistles of the rotary and the two locomotives, the sound the rotary makes, and the sound showing the struggle of the engineers had to keep the train moving forward with frequent slip. I imagined running the throttle on the forward locomotive as I listened to the sound, slowly throttling forward, then suddenly back when wheel slip occurred. I am sure the 2nd locomotive slipped several times but I could only identify two times from the sound. It was hard to tell which loco was slipping a lot of the time.