Hi C N 1. yes juice from the overhead.
First I installed a center on/off switch then ran the power to the center terminals.
Then wire one side for overhead and the other side for two rail.
ie + and - to the two rails on one sde of the center off switch .
Then + to the pole and - to one rail. make sure the + = + on one side.
The trick is to have the insulated wheels on the interurban on the side you dont want to pick up power .
Then you can run both at a flick of a switch so to speak.
I have no continuity problem to worry about. so it worked for me. :thumb:
btw if running overhead all the time then it`s + to the pole and - to both rails making sure you CHANGE the wheel insulated set to opposite sides so you can pick up - from all wheels.
Of course you have to open the unit up and rewire for overhead i e one pickup to all wheels other to overhead.
Simple eh