My attempts at soldering power drops to the rails did not go well at all. The metal used in the rails requires a lot of prep... and one second too long with the iron and you will melt the plastic loose from the ties. it was far easier to solder the wires to the bottoms of te rail joiners. A lot less prep work.
I used a scrap of plywood and cut some grooves which just happen to be wise enough to hold the rail joiners upside down perfectly .
