My 2 Cents worth…
My previous layout, before we moved in 05, was approximately 250 foot mailine and track powered… Before I installed any track, I removed all the rail joiners and packed the with LGB’s electrical grease… My electrical connection was a Bachmann clip on track connector, using a train engineer and 10 amp power pack, and all this worked fine, for about 3 years…
At the 3 year point, I started having an occassional power loss on a section of track… Once located, the power loss was because of the screws backing out and becoming loose, and or coming out completely… The fix for this, was to go and tighten all the rail joiners screws… I eventually ran some wire and made 2 other electrical contacts with the rails, hard wired to the rails… Occassionally, I would still have to go and tighten the screws…
My current layout outside, will all be battery power, or live steam … Inside, will be track power and battery…
No matter what type of railroad you desgin and build, you will always have maintenece to perform, it’s a fact of life…
For what it’s worth…