One point to keep in mind - independent of the quality of the steel, for many of the lighter rail weights (85, 90, 100), there really isn't a "standard" profile. Looking at a listing of rail sizes available as relay rail from L.B. Foster, there are almost two dozen different combinations of height, base, head width, and web thickness for 85-lb rail alone, a dozen-and-a-half versions of 90-lb rail, and over a dozen versions of 100-lb rail. Even in the heavier weights there are at least a few different versions.