I was running low on Atlas track nails with the rounded head and 5/8" long.
I wanted to re-order but found that they were out of stock at many sellers. I found these at MB Klein and thought I'd pass along the info for anyone in the market for a good track nail/brad.
https://www.modeltrainstuff.com/urlrewrite.asp?404;http://www.modeltrainstuff.com:80/AHM-5663-N-Track-Spikes-with-Round-Head-220-Pieces-p/ahm-5663.htm
These look identical (even better) than the Atlas 2540s and at 17.5% the cost!
New Old Stock, mine arrived today and they are well worth the 69¢ Blast From The Past!
Happy modeling, Ed