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This is HO scale equipment (1/87th) running on narrow gauge rails spaced 3 feet apart. Narrow gauge in other scales is represented in a similar fashion. There are similar notations for models whose gauge is based on non-English measurements, such as HOm (HO scale, one-meter gauge) and HOe (HO scale, 0.75 meter guage), as well as HOn30, which indicates 30″ (2.5′) gauge.
