Related Scales
The other NEM defined narrow gauges for HO scale are HOm (using 12 mm/0.472 in gauge originally TT scale track) for models of 1,000 mm (3 ft 3 3⁄8 in) gauge and similar prototypes and HOi (using Z scale 6.5 mm/0.256 in track - also known as HOf) for prototypes around 600 mm (1 ft 11 5⁄8 in)- the most popular gauge for industrial (or Feldbahn) railways.
In the United Kingdom where the most popular railway modelling scale is 4 mm/ft or 1:76 scale, the narrow gauge equivalents to HOe and HOm are OO9 and OOn3 for modelling 3 ft (914 mm) gauge railways—widely used in Ireland and the Isle of Man—on 12 mm (0.472 in) gauge track.
In the United States the NMRA have developed many standards for narrow gauge modelling, including those modelling in HOn30 and its related gauges.
The following table lists other combinations that are close to HOe/HOn30 in either scale or gauge;
| Name | Scale | Gauge | Prototype gauge | Used for |
|---|---|---|---|---|
| HOn2 | 1:87 | 7mm (0.276 in) | 2 ft (610 mm) | United States |
| OO9 | 1:76 | 9 mm (0.354 in) | 2 ft 3 in (686 mm) | United Kingdom |
| OOn12 | 1:76 | 12 mm (0.472 in) | 3 ft (914 mm) | United Kingdom |
| Sn2 | 1:64 | 9 mm (0.354 in) or 10.5 mm (0.413 in) | 2 ft (610 mm) | United States |
| HOm | 1:87 | 12 mm (0.472 in) | 1,000 mm (3 ft 3 3⁄8 in) | European |
| HOn3 | 1:87 | 10.5 mm (0.413 in) | 3 ft (914 mm) | United States |
Read more about this topic: HOe Scale
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