Standards

Complete
This is the complete standard in one page in millimetres only. It makes a pretty good handout for clinics, exhibitions and so on. Mail the sig coordinator for a Corel Draw version if you would like better print quality.
Track
The major dimensions for track. The page includes a comparison to North American prototype, and to standard HO. Dimensions are given in inches and millimetres.
Wheels
The major dimensions for wheels. The page includes a comparison to North American prototype, and to standard HO. Dimensions are given in inches and millimetres.
Wheel Profile
The detailed dimensions of the standard Proto:87 wheel profile. This profile is a scaled version of the British BS275 standard wheel. Joe Brook Smith wrote a good article in Journal number 5 on this subject.