possibly for Locos with 5′ 0″ driving wheels, and pins between the spokes.
at 1:24, ½" : 1ft scale
Originally made for the SAR 15F from an incorrect drawing in a well known magazine.
They may be of some use for some other locomotive.
Links: Home.
Castings stock and price list.
Wheel data: H101and H102.
Narrow gauge loco set price list.
Full size for 103 dpi screens.