Mark,
I can tell you that my RR with hard soldered brass rail, is track powered with ONE set of feeder wires to the middle of a 300 plus feet of (dogbone)loop and minimal voltage drop. If you decide on the brass rail and your concerned about abuse one thing I did learn is to go with the euro ties (if you decide on Aristo or USA) as they are MUCH more robust. This has worked well for me over quite a few years and I have learned from my mistakes and this is why I’m sharing what has worked for me. BTW the rail MUST float in the ties (meaning remove any screws securing the rail to the ties if it has any depending on what you choose).