I was looking at a Hafner/Wyandotte windup train advertisement and noticed that the trainset came with an automatic stop/start mechanism. After seeing one of the mechanisms I noticed that the on/off levers on both of my engines also exits out the bottom. So I built my own stop mechanism so that the gondola of the train would stop in front of my Wyandotte Coal(marble) Loader. Here is a video of what I came up with.