Comments

A word about the current P:64 standards. The original proposal listed below has unfortunantly proved less than workable. For such fine work we should look to the NMRA refinement that needs to be tested before final adoption.

The NASG Recommended Practices, also listed below, are not truly Proto as they contain compromises to accommodate RP25 wheels. That said they are achievable with commercial components. Code 88 wheels are availiable from either Des Plains Hobbies or NWSL and look much better than Code 110 wheels. Together, this makes a good semi-proto track/wheel system and may well be an acceptable compromise for some.

 
 
 

Standard, Recommended Practice, or Practical Application	Track  Gauge (G)		Check  Gauge (C)		Span (S)		Flangeway Width (F)		Point to Rail (P)		Back to  Back (B)		Tire  Width (N)		Flange  Width (W)		Flange  Depth (D)
	Min	Max	Min	Max	Min	Max	Min	Max	Min		Min	Max	Min	Max	Min	Max	Min	Max
1/64th Prototype (inches)	.883	.889	.855	.855			.029	.030	.083		.832	.832	.086	.086	.018	.022	.022	.022
Proposed P:64 Standard (inches)	.883	.90*	.853	.855			.030	.040*	.083		.827	.833	.086	.088	.018	.020	.018	.020
NASG P:64 Recomended Practices(inches)	.883	.909	.851			.822		.041	.838		.824		.087					.026
NMRA/NASG S scale Standard (inches)	.875	.898	.823					.057	.064		.777		.124			.025	.031	.031
NMRA RP-25 Code 110 wheel													.110	.110	.030	.030	.025	.025
Des Plaines Hobbies/NWSL RP-25 Code 88 wheel													.088	.088	.025	.025	.023	.023
NWSL P:64 Code 87 wheel													.087	.087
Proposed P:64 wheel													.086	.088	.018	.020	.018	.021

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