for NRZ/RR (National Railways of Zimbabwe/Rhodesian Railways) 4-6-4+4-6-4 15th class
at 1:12 scale for 3′ 6″, Cape Gauge on 3½″ gauge track.
The castings have similar dimensions to those for standard gauge 1:16 scale on 3½″ track except for extra the tyre width. That is 11.1 mm (plus the usual machining allowances), and represents a 5¼″ wide tyre at 1:12 scale.
A full set consists of 16 x M421 plain wheels, 8 x M422 coupled and 4 of M423 driven wheels.
Links: Home. Casting prices and stock. Cape and narrow gauge loco set price list. Wheel data: M421. M422, M423.
Bryn Morgan's SAR group: https://www.facebook.com/groups/225873694237866/.
Full size for 103 dpi screens. Bare weight c. 14.5 kg.