Lego Automatic Direction Changer for Power Function

This is Automatic Direction Changer for Power Function Train. In my childhood, I played Lego train with “#157 Automatic direction changer“. #161 is in this video, but not work... (Now I don’t have #157... A few years ago, I got this #161. ) If I speed up this train, it doesn’t work and breaks. In this video it is lowest speed.