In
rail transport modelling
Railway modelling (UK, Australia, New Zealand, and Ireland) or model railroading (US and Canada) is a hobby in which rail transport systems are modelled at a reduced scale.
The scale models include locomotives, rolling stock, streetcars, t ...
, Sn3½ is a scale/gauge combination derived from
S scale
S scale (or S gauge) is a model railroad scale modeled at 1:64 scale, S scale track gauge (space between the rails) is 22,48 (22,5) mm, 0.885 in. S gauge trains are manufactured in both DC and AC powered varieties. S gauge is not to be confused wi ...
to represent
narrow gauge
A narrow-gauge railway (narrow-gauge railroad in the US) is a railway with a track gauge narrower than standard . Most narrow-gauge railways are between and .
Since narrow-gauge railways are usually built with tighter curves, smaller struc ...
track by using gauge track (the same as
HO gauge). The scale is
1:64.
Sn3½ is popular in
South Africa
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring count ...
,
Australia (particularly
Western Australia
Western Australia (commonly abbreviated as WA) is a state of Australia occupying the western percent of the land area of Australia excluding external territories. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to ...
,
Queensland
)
, nickname = Sunshine State
, image_map = Queensland in Australia.svg
, map_caption = Location of Queensland in Australia
, subdivision_type = Country
, subdivision_name = Australia
, established_title = Before federation
, established_ ...
and
Tasmania
)
, nickname =
, image_map = Tasmania in Australia.svg
, map_caption = Location of Tasmania in AustraliaCoordinates:
, subdivision_type = Country
, subdi ...
where narrow gauge systems exist) and
New Zealand
New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 List of islands of New Zealand, smaller islands. It is the ...
.
Sn3½ is very rarely or never used for modelling in other countries with 3 foot 6 (1067mm) gauge railways such as Japan, Taiwan, Indonesia etc.
Track
As track scales down to 16.5mm at 1:64, modelers use HO gauge track (which represents
Standard gauge at 1:87 scale) on Sn3½ layouts.
New Zealand

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. Many of these kits are highly detailed. Buildings are generally hand-made and track (HO gauge track) can either be purchased or hand laid with sleepers and rail. Alternatives for modeling New Zealand railways is
1:120 or TT scale, known as
NZ120, as it is a cheaper option.
HOn3½ gauge
HOn3 gauge represents the modelling of gauge railways in HO scale, resulting in a model track gauge of (the same as H0m and TT scale). Trains are operated using direct current or Digital Command Control over realistic-looking two-rail track.
Ra ...
, HO scale with 12mm gauge, is also increasing in popularity.
New Zealand Sn3½ suppliers and manufacturers
South Dock ModelsRailmaster ExportsNew Zealand FinescaleNorth Yard(Model Railway Parts)
Sm
Sm gauge is also defined by the German NEM 10 standard,
representing Continental European metre gauge.
See also
*
List of narrow-gauge model railway scales
*
Rail transport modelling
Railway modelling (UK, Australia, New Zealand, and Ireland) or model railroading (US and Canada) is a hobby in which rail transport systems are modelled at a reduced scale.
The scale models include locomotives, rolling stock, streetcars, t ...
*
Rail transport modelling scales
Rail transport modelling uses a variety of scales (ratio between the real world and the model) to ensure scale models look correct when placed next to each other. Model railway scales are standardized worldwide by many organizations and hobbyist ...
*
List of rail transport modelling scale standards
This page lists the most relevant model railway scale standards in the world. Most standards are regional, but some have followers in other parts of the world outside their native region, most notably NEM and NMRA. While the most significant sta ...
References
Citations
Bibliography
*
*
{{DEFAULTSORT:Sn3.5 Scale
Model railroad scales
Narrow gauge railway modelling