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Proto 64 home page
NMRA P:64 Standards

Last Updated April 12, 2011

 

Comments

A word about the current P:64 standards. The current Standards, listed below, use an engineering allowance called FIT with any scale less than 1:56. 

    


 Proto:Scale Ratio Gage Fit Slide









Results: Proto:64 64.00 Standard 0.001 0.002

TR-1-2005
6/2/2007



Select:
56.5 Variance
See TN-1.1.2 for formula explanations


















S-3.1 TRACK G C S F F H P R *
Name of Scale Track Gage Check Gage Span Flangeway Frog Flangeway Guard Flange Depth Switchpoint Spread Railhead Radius
Min Max Min Max Min Max Min Max Nominal Min Max Min Max


Proto:64 Inch 0.883 0.902 0.851 0.853 0.814 0.823 0.028 0.030 0.031 0.020 0.809 0.006 0.009
mm 22.43 22.91 21.62 21.67 20.68 20.90 0.71 0.76 0.79 0.51 20.55 0.15 0.23



S-4.1 WHEELS K B N T D


Name of Scale Wheel Check Gage Back to Back Wheel Width Flange Width Flange Depth WHEEL GAGE

Min Max Min Max Min Max Min Max Min Max Min Max




Proto:64 Inch 0.844 0.849 0.825 0.834 0.087 0.092 0.017 0.019 0.018 0.020 0.859 0.872

mm 21.44 21.56 20.96 21.18 2.21 2.34 0.43 0.48 0.46 0.51 21.82 22.15

                               

 

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