Chaos in the train room & focus on removable bridge & wiring


Wouldn’t O be AC powered?
So your “ground” would actually be neither positive or negative or ground?
I think you would need equal lengths of each and number of feeders… been years since I worked with O scale, I still have some tho but no power.
Cool trains by the way!
 
It's all AC, I'm not much of a model rail road guy, just enjoy then for fun. When I think neutral or common and ground its like with your typical 110 plug & circuit in your home. Black is "hot" , White is "neutral", bare copper "ground". On a 110 circuit neutral and ground essentially end up being ground.
 
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