What I have done, is use through the hole via's, to bring power from underneath the track, to the top of the tie. Through the hole via's, are used to move power from one side of a double PCB board, to the other. What I do, is drill a 1.1mm hole through the PCB tie. I then place a via, that is 1mm outside diameter, with a .8mm inside diameter from the top down, run a 22AWG stranded wire from the bottom up, through the via, then drop a small bit of solder on top of the tie. I also power the frog this way. Then drill holes through the road bed, and wire to the main power. One last thing, be sure and cut a slot in the copper foil on the bottom of the tie. Didn't think to do this on the first one.