Proto is more than fine or extra fine. The latter two us RP25 wheels with ever tighter math for flange ways etc. The Proto idea is 'scale the real thing' and uses a wheel profile that matches this ideal. This requires the rail to also have a profile and the math is very exacting. Not something that can be manufactured at more than the part level.
Talmadge C 'TC' Carr Sn42 and Hn42 somewhere in the wilds of the Pacific Northwest [email protected] On Jul 6, 2013, at 5:08 PM, [email protected] wrote: > > Dave, Thank you, now I understand. Is this a re-statement of the past > fine-scale math standards, or is something new on the board to make a need > for a new name? Lee
