I noticed on my Hafner/Wyandotte windup engine that the lever that is used to lock the gears also extends out the bottom. I found this old advertisement that shows they did offer a stop mechanism. Has anyone seen this mechanism or a photo of one. I would like to make one so that the train would stop in front of my marble unloading tower. So, instead of me trying to reinvent the mechanism, I would check and see if anyone has information (preferably a photo) of the mechanism. I circled the stop mechanism in red.