Railway Modelling and Wargaming - general
Scales, gauges and trackssince throughout history and around the earth there were and are many gauges,
http://en.wikipedia.org/wiki/List_of_rail_gauges it is impossible to simulate them with TT, H0, S, and O standard model railway gauges (12, 16,5 ; 22 ; 32 mm respectively)
http://en.wikipedia.org/wiki/List_of_rail_gaugesthe basic standards in countries are narrow, standard and broad gauge, but these are not international standards
european trains to spain and russia even today have to be re-gauged
TT is 1:120 scale and useful for
15 mm wargaming - although it is a niche scale and hard to get
the 12 mm track gauge would correspond to 120 cm real life in 15 mm scale, which allows both narrow and standard gauge representation.
for
20 mm / 1:87-1:72 HO or OO gauge is the choice
this is the widest spread railway modelling scale and it usually fits perfectly with 20 mm
28 mm wargaming is difficult with railway scales
In 28 mm, with HO track you can simulate exclusively narrow gauge - in 28mm/ 1:56 this would be 92,4 cm real life
S gauge, which is rather not frequent, is in our model scale 123 cm real life, that is well below general standard gauge, which is around 150 cm
0 gauge, which is very frequent as a large scale, would be 179 cm real life and well above standard gauge, nearing broad gauge in real life
meaning that either You decide on a special region and time for your track in order to have it accurate, or You go for availability of the rolling stock, which is 0 and 0n30 (1:48 on H0 track - narrow gauge)