User:Wahiba/3 Gauge

3 Gauge or Gauge 3

3 gauge is a model railway gauge of 2.5" or 63mm. It is the largest gauge used for layout modelling and the smallest used for locomotives that can pull a small passenger load.

Links

http://www.gauge3.com/ a US perspective
http://www.gauge3.org.uk/ a UK perspective
http://www.users.waitrose.com/~n25ga/ 2.5" gauge society

Exactly the scale is 1/22.6 usually modified to 1/22.5. G gauge uses the same scale but runs on 45mm gauge 1 track so mainly emulates metre/3'6" gauge locos.

Scale 1/24 is a more rounded figure and here 2.5" represents 5' gauge. The difference from standard gauge is small enough to be ignored so 1/24 also called 1/2inch scale as 1/2" equals 1 foot. In metric 1/25 is near enough to make no practical difference.