Hello all ..you might enjoy seeing the Bronx Terminal O scale steamer sold as a kit ( handful of raw castings) ..by Hobby Craft Stores , NYC ( Model Craftsman) ... running on outside 3rd rail .... Bronx terminal the most track per square foot of any RR .
Please see link for switcher ...switching
cheers Carey
https://www.youtube.com/watch?v=55KjnQBegh4