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Proto 64 home page
Original Standards Proposal &
NASG Recomended Practices

Last Updated April 12, 2011

Comments

A word about the current P:64 standards. The original proposal listed below has unfortunantly proved unworkable.

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
.851

.822

.041
.071
.824

.087




.026
NMRA/NASG
S scale Course (inches) 
.875 
.898 
.823 
 
 
 .775
 
.057 



.777 
 
.122 
.126 
 .032
.036 
.023
.031 
NMRA/NASG
S scale Standard (inches)
.883
 .895
 .839
 .848
 .791
 .798
 .035
 .050
 .086
.800
 .809
 .108
 .112
 .028
 .032
 .020
 .030



















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
.020
*use this wider dimension only on curves
If you have questions or comments about this site,
  write the Proto:64 Webmaster at
  p64 AT dapenguin DOT net

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