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Introduction

This Page Updated April 12, 2002

Welcome to the Proto:64 Special Interest Group’s (SIG’s) presence on the world wide web. This site should answer all of your questions about Proto:64 modeling, who’s doing it, and why we would like you to join us. The author of this site is Keith Thompson. If you have any questions about this site, please contact the Webmaster at
mhrreast AT yahoo DOT com

What is Proto:64?

Proto:64 is S scale (3/16" = 1') modeling using finer standards for track work and wheelsets. The most obvious difference between Proto:64 standards and NMRA/NASG S “scale” standards are the width of the wheels and the associated narrower flangeways. The existing NMRA S-4 standards use wider-than prototype wheels to compensate for less-than-fastidious track work.


NMRA/NASG Code 124 “Scale” Wheel Profile	NMRA/NASG Code 110 Wheel Profile	NMRA/NASG Code 88 Wheel Profile	Prototype Wheel Profile

Why Proto 64 now?

S scale standards were developed years ago when machining and molding techniques weren’t as sophisticated as they are today. The resulting model work is still quite good but Proto:64 practitioners are striving for that “just like the prototype” look. Proto:64 takes advantage of finer tooling techniques and better materials. Don’t get us wrong, we all come from the S scale world and some of us pick and choose Proto:64 standards to suit our on individual tastes. The glue that binds us is a desire to have the most realistic models in 3/16" scale.