Source for wire

Grainger Supply and Auto and Industrial Fastener Houses at the wholesale level. 

In my opinion, AWG 20 stranded wire is a tad too small for track power leads, but just fine for leads to individual accessories. AWG 18 is easy to work with and has less resistance to current flow. Some will say AWG 16 is even better yet.

Wire can be had for very cheap on ebay.

Walthers carries wire at a decent price from Wire Works...

https://dealers.walthers.com/e...ctinfo/851-120100400

This example is your 20 gauge in black, but they have red, various gauges, et al, and larger spools.

They and other hobby distributors sell the Miniatronics line, which includes spools of wire, various colors, various gauges such as #18...

https://dealers.walthers.com/e...ductinfo/475-4818001

Of course, your local electrical retailer/wholesaler has wire.  Automotive shops, too, although it's often more costly due to harsher environments (fuels, etc.).  Big Box stores like Home Depot, Lowes, et al, have wire by the foot, or on smaller quantity spools. 

FWIW...

KD

OGR wire from their website.  

Single strand wire #10, #12, #14, #16 and #18 is available in 500 ft lengths, either solid or stranded, from your local electrical supply. 

Thermostat cable, 18 gauge solid, is available in cable combination, 2 conductor through 12 conductor, also 500 ft rolls.

For light loads and switches I buy 50 foot rolls telephone wire. ($12.99) I strip the outside plastic wrap off. I end up with 4 colors (red, green, black, yellow). I cut to length I need and amount of wires and clamp one end in a vice. I then put other end into a drill chuck and twist. Normally I include one extra wire for future use. I tin the wires before climbing under the table if needed. 

For larger gauge wires I buy the 100 foot rolls at Lowes. they stock a few colors and you can order more colors if needed. 

I have learned if I am working late at night and stores are closed DO NOT use the wrong color wire.  It may take years but at some point it will bite you. 

I should have stated that I want the wire  for rewiring my Lionel operating cars pick up shoes.

On ebay, and other places, you can get "super flex" wire. It is a good choice where the wire will be constantly moved around such as when the truck turns on the track. It has many very fine wires stranded together. You can bend it pretty serverly and not kink it or break it. 

Regular stranded wire is too stiff for trucks to turn freely. JMHO

http://mikestrainsandhobbies.com/parts/wire.html

Brad,

I have a large spool of this SUPER FLEXIBLE Wire for Pickup shoes and Pickup Rollers.  Tell me how many feet you need, your shipping address and I will send you some!!

Fredstrains

I have the Flexible Wire you are looking for. Send me an address and will give you several feet. It's yours for the asking!@!!

FREDSTRAINS