what is the difference in track codes 100,125,148 i only use gargraves what does it compare to in the codes thanks for your help
tom
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Tom,
The codes are the height of the rails above the ties in thousandths of an inch, for example, code 125 rail is 0.125" high.
GarGraves rail height is somewhere around code 250 (0.250") if I remember correctly. Will measure next time I'm downstairs in the basement. 
Jim
I just measured a piece with a dial caliper. It's a bit tricky with the built in flange on the bottom but it works out to around code 215 rail which is what Atlas 3 rail track is. It is most certainly not code 250. I have some bulk code 250 rail and it is noticeably taller.
The NMRA, National Model Railroad Association, website has excellent info:
http://www.nmra.org/standards/sandrp/rp-15_1.html
Matt
