16 mm to 1 foot or 1:19.05 is a popular scale of model railway in the UK which represents narrow gauge prototypes. 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) 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), 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.