Sn3½

Sn3½ is popular in South Africa, Australia (particularly Western Australia,[1] Queensland[2] and Tasmania[3] where narrow gauge systems exist) and New Zealand.

[4] Sn3½ is very rarely or never used for modelling in other countries with 3 foot 6 (1067mm) gauge railways such as in Japan, Taiwan, and Indonesia As 3 ft 6 in (1,067 mm) track scales down to 16.5 mm at 1:64, modelers use HO gauge track (which represents standard gauge at 1:87 scale) on Sn3½ layouts.

[5] Sn3½ is the primary scale for modeling New Zealand's narrow gauge 3 ft 6 in railways.

The majority of rolling stock available, are white-metal kits, making them considerably more expensive and heavier than other scales and countries.

Alternatives for modeling New Zealand railways is 1:120 or TT scale, known as NZ120, as it is a cheaper option.