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My edu-guess is M.E. weathered rail on Central Valley tie strips.
I'm printing in FXD. I'm not sure of the strength of the pocket. I just ordered a bunch, when they get here and I get one installed, I can try and do some sort of test.
Anyway, take a look at the photo five posts up, and you'll see where it lands vs. the height gauge, using the stock pocket with no filler.