You can get them from Micromark. They have all kinds of small screws. Look under hardware, then wood screws. Good-luck.
www.micromark.com
Paul is probably right, I forgot about Micro-Mark !! Here are the ones I use on Gargraves track. I got them at a small hardware store a couple years ago. Busy Beaver, I think I use a the orange tool, countersink, to get them down even with the tie, then paint the screw black. I show 2 sizes here, 1/2 & 5/8. I also have some 3/8, no good !
Hope this helps !
John
The Atlas track screws are 3/4" long and somewhere between #2 & #3 to my eye.
Another source of screws of any size you can imagine is McMaster-Carr. They are an industrial supply house but as near as I can tell, anyone with a credit card can buy from them. http://www.mcmaster.com/ It might take a while to wade through their on line catalog.
I have used Home Depot with great success for the correct track screw with one humorous side note. My order was delayed due to a security check to see why I was ordering a couple hundred of these small sheet metal screws. Seems I became a national security risk in the minds of Homeland Security. Had to end up signing an affadavit of my intent.
Go figure, huh????
Try boltdepot.com. http://www.boltdepot.com/product.aspx?cc=11&cs=45&cm=7&cd=586
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