7 mm scale

7 mm scale
O gauge layout at the Trains and Boats exhibition
Scale7 mm to 1 ft
Scale ratio1:43.5
Model gaugemultiple

7 mm scale, also known as British O scale is a model railway scale of 1:43.5 (or 7 mm to 1 ft; hence its name).[1] The scale is thus different from American O scale (1:48)[1] and European O scale (1:45). For standard gauge railways, 32mm gauge, or 0 gauge is most commonly used.[1] ScaleSeven (S7) standard however specifies 33 mm gauge, which is closer to scale.[1] For narrow gauge modelling, 16.5 mm gauge

Name Model gauge Scaled gauge Prototype gauge
Prototype standard gauges
British 0 gauge 32 mm (0 gauge) 4' 6¾"[citation needed] Standard gauge
ScaleSeven (standard) 33 mm 4' 8½" 4 ft 8+1⁄2 in (1,435 mm) standard gauge
Prototype broad gauges
ScaleSeven (Irish) 36.75 mm 5' 3" 5 ft 3 in (1,600 mm) Irish gauge
ScaleSeven (Great Western) 49.2 mm 7' 0¼" 7 ft (2,134 mm) Great Western broad gauge
Prototype narrow gauges
O21 21 mm 3' 3 ft (914 mm)
O16.5 16.5 mm (H0 gauge) 2' 4¼" 2' - 2'6"
O14 14 mm 2' 2 ft (610 mm)
O9 9 mm (N gauge) 15½" 15 in (381 mm)

References

  1. ^ a b c d "Model Railway Scales and gauges explained". World of Railways. 16 January 2019. Retrieved 10 November 2024.


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