I just lightly hit the spot to be soldered with the Dremel with a fiber cutoff wheel to rough up the surface. Break out my 100/140W Weller gun and tin the spot and then solder the wire on. If you can pick up the track or it's not down yet, you can expose a section of the rail under the track and keep the connection hidden. Remember that if you solder to outside rails, do it on the outside so the flanges don't hit your soldering job.
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