Connecting another set of wires to track or soldering?

[RobertInOntario]

Just a quick note to let you know that I've basically finished this "project". I have isolated 3 sections on this inner loop which really increases what I can do on the layout, i.e. park one loco on one side of the layout while I move another train onto this line or, better still, have one train stopped at the station while I can do some shunting on the other side of the layout. This also enables me to operate 1-2 more trains on the layout (that is, I can still have 2 that are operating with another 4 parked on sidings ready to go when needed).

Thanks for your help and feedback with this!