page_title: On30 gauge
section_title: On30
hierarchical_section_title: On30 gauge / Definitions / On30
caption_attribution_description: English: Bachmann Spectrum Rail Truck. Detail image of a private model railway layout in 0n30 scale. Deutsch: Bachmann Spectrum Schienen Lastauto (Rail Truck). Ausschnitt aus einer privaten Modulanlage in der Spur 0n30.
context_page_description: On30 gauge is the modelling of narrow gauge railways in O scale on HO gauge track in 1:48 scale ratio by American and Australian model railroaders, in 1:43.5 scale ratio by British and French model railroaders and 1:45 by Continental European model railroaders.
context_section_description: On30 uses the American O scale of ​¹⁄₄ inch to the foot, (ratio 1∶48) to operate trains on HO gauge (16.5 mm / 0.65 in) track. The 30 indicates the scale/gauge combination is used to model 2 ft 6 in (762 mm) narrow gauge prototypes, although it is often used to model 2 ft (610 mm) and 3 ft (914 mm) gauge prototypes as well. This scale/gauge combination is sometimes referred to as On2​¹⁄₂.
caption: A Rail Truck  based on the Bachmann Industries model.
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