Train Scale / Gauge quick guide
|Scale||Ratio||Gauge (Track rails spaced apart)|
|Z||1:220||6.5 mm (0.256 in)|
|N||1:160||9 mm (0.354 in)|
|h0 (HO)||1:87||16.5 mm (0.650 in|
|h0n3||1:87||9 mm (Narrow Gauge)|
|00 (OO)||1:76||16.5 mm (0.650 in)|
|0 (O)||1:43.5 (1:45)||32 mm|
|G||1:22.5||45 mm (Narrow Gauge)|
Below is a first "european" comparison
chart. It gives most combinations available.
Sample 1: When modelling standard gauge prototype in scale 1:87, the scale name would be h0 (half zero or commonly HO) and the gauge 16,5mm.
Sample 2: When modelling meter gauge prototype in scale 1:22,5, the scale name would be IIm (2m) and the gauge 45mm.
Sample 3: If one wanted to model South African mainline prototype in 1:87 one would use TT track, although the sleepers wouldn?t be spaced correctly!
|850 < 1250||Zm||Nm||TTm||h0m||Sm||0m||Im||IIm||IIIm||Vm||VIIm||Xm|
|650 < 850||Ne||TTe||h0e||Se||0e||Ie||IIe||IIIe||Ve||VIIe||Xe|
|400 < 650||TTi||h0i||Si||0i||Ii||IIi||IIIi||Vi||VIIi||Xi|
|in inch||1 3/4||2 1/2||3 1/2||5||7 1/4||10 1/4|
note 1: From I scale up arabic numerals are common
note 2: 0 scale used to be 1:43,5 and in some countries still is
note 3: For the larger scales the inch description is more common
Used indexes with scale name:
m = meter gauge
e = narrow gauge
n = narrow gauge
nX = narrow gauge plus indication of prototype gauge in feet, i.e. n2 or n3.
So in 1:87 scale meter gauge would be h0m and 3 feet gauge would be h0n3
For all intents and purposes it is the same.
Then to add to the confusion, the islanders have to be different of course. They use 1:76 (00) and 1:148 instead of the normal 1:87 and 1:160.
It is difficult to pick this up in a model as the prototypical loading gauge is smaller than the continental or the American one.
And they sometimes indicate scale in mm per foot as well:
3,5mm scale would be 1:87 (h0)
4mm scale would be 1:76 (00)
7mm scale would be 1:43,5 (0)
2mm scale would be 1:152