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18 gauge wire should work fine depending upon how long the wire run is.
18 GA. Stranded. NOT solid.
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
I have also had good luck with speaker wire, again paired, inexpensive, color coded, stranded, many gauges out there.
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.