Walthers vintage O gauge steam engine 060 switcher with Polydrive , 1940-1. Polydrive system developed by Walthers ...utilized standard components to create multiple steam engines ..from a 060 up to a 484.
Design was good but final product had many mechanical short comings ....resulting very few Polydrive engines are running today. Walthers planned to fix all the "issues" postwar ...but production never began.
See link for video
