Connecting another set of wires to track or soldering?

[RobertInOntario]

Thanks, folks, this is helpful.

I'll probably consider soldering a new set of bus wires to this other section.

I already had to do this to the "new" section of track that I isolated from the rest of the loop. Drilling the hole & threading the wire through wasn't that hard, but getting the one strand of wire under the track was a little messy. The soldering was done easily enough.

Cheers,
Rob