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Hey, somebody had to ask, right? I've been looking more carefully at original drawings--not a real tie plates. I notice that in both 3-hole flanged and unflanged, and in the more modern 4-hole double-flanged tie plates, all of the holes are not the same size. For example, the punching for PRR 3-hole plates shows one 7/8" sq hole on the field side, and on the track side it has one 7/8" and one 1" sq hole. This is the layout for the 100 lbs plate. Now get this... For the 85 lbs plate--same drawing--it has the same two 7/8" sq holes, one on each side of the rail, but now the 3rd hole is spec'd to be punch as 15/16". Likewise on even newer 4-hole tie plates, regardless of rail weight, I see at least one hole punch larger. What's up?
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