help what kind of wire should I?

18 gauge wire should work fine depending upon how long the wire run  is. 

18 GA.  Stranded.  NOT solid.

Hi Fred,

I am just getting ready to wire a layout, 8' x 28' with three separate O gauge lines and two separate S gauge lines.  The S gauge will be run off of a ZW.

Why do you recommend stranded instead of solid?  

Thanks,

LionelFlyer

I always recommend stranded for stuff like this for a simple reason, it's much easier to work with!  The trains will run just fine with either type of wire, but why make it harder to wire?

I have been playing with Alarm wire, paired,  inexpensive, color coded and solid copper. (I prefer solid copper, no judgment on people who like stranded.)

$26 for 500 feet

https://www.amazon.com/Conduct...TG9nQ2xpY2s9dHJ1ZQ==

I have also had good luck with speaker wire, again paired, inexpensive, color coded, stranded, many gauges out there. 

https://www.amazon.com/AmazonB...dExvZ0NsaWNrPXRydWU=

Lionelflyer,

You did not mention what you plan to run, I have a layout, 8x38ft. I ran a buss wire for my tracks, two separate loops. I ran 14ga. stranded wire for the buss because I do run some post war locomotives. I have 18ga. wires connecting the track to the buss.  Just a suggestion.

Ray