I take the dremel and clean a spot on the track. I try to solder to the side of the track less seen or at least on the inside. I use a weller gun to heat the track and tin the spot with a glob of solder, then having already tinned the wire, a little more heat to the track and the wire will solder pretty easily. Finish by coloring the wire black with a marker. I think atlas is easier to solder to than tin plate. Some folks drill a hole in the bottom of the track, stick the wire through and then solder, that seems to work well too.
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