Connecting another set of wires to track or soldering?

[RobertInOntario]

Yes I would also go for the additional wires, instead of soldering joints.
While joints can be solders, it will cause absolutely no room for expansion of the rail. even in an air conditioned room, rail will still contract and expand, and in many cases, the train room is not air conditioned. Expansion (or contraction) over the years can cause problems. If the rail can't expand, it will start to slowly move the rail loose from the road bed, create allignment problems as it will bend/flex and might cause derailments. It's a slow process, but preventing is always the preferred approach. Leave a little gap here and there at irregular intervals, to allow for this. (you'd even get some 'clickety clack' sound effects thrown in as a bonus :-) )
Koos

Thanks, this sounds good. I'll try to add them over the next few days.