16 mm scale

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16 mm scale
Modified Mamod live steam locomotive and train on a garden railway layout
Scale	16 mm to 1 foot
Scale ratio	1:19.05
Model gauge	32 mm (1.26 in)
Prototype gauge	2 ft (610 mm)

16 mm to 1 foot or 1:19.05 is a popular scale of model railway in the UK which represents narrow gauge prototypes.^[1] The most common gauge for such railways is 32 mm (1.26 in), representing 2 ft (610 mm) gauge prototypes. This scale/gauge combination is sometimes referred to as "SM32" (terminology popularised by Peco, one of the principal manufacturers of appropriate track)^[1] and is often used for model railways that run in gardens, being large enough to easily accommodate live steam models. The next most common gauge is 45 mm (1.772 in),^[2] which represents the theoretical non-existent gauge 2 feet 9+3⁄4 inches (857 mm). This gauge is commonly used to portray prototypes between 2 ft 6 in (762 mm) and 3 ft (914 mm) gauge.