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Proto 64
Standards in progress

Proto 64 Standards

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Standard, Recommended Practice, or Practical Application 
Track 
Gauge (G) 
Check 
Gauge (C) 
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 
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 NMRA/NASG P:64 Standard (inches)
.883 
.90* 
.853 
 
.030 
.040* 
.083 
.827 
.833 
.086 
.088 
.018 
.020 
.018 
.020 
NMRA/NASG S scale Standard (inches) 
.875 
.898 
.823 
 
 
.057 
.064
.777 
 
.124 
 
 
.025 
.031 
.031 
                               
.110 
.110 
.030 
.030 
.025 
.025 
.088 
.088 
.025 
.025 
.023 
.023 
.088 .088 .025 .025 .023
.023
.086 .088 .018 .020 .018
.021
*use this wider dimension only on curves 

Blue text indicates the most recent change.

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