Rail gauge is the distance between the inner sides of the two parallel rails that make up a railway track. Sixty percent of the world's railways (prototype 1:1) use a gauge of 1435 mm (4 ft 8½ in), which is known as the standard or international gauge. Gauges wider than standard gauge are called broad gauge, those smaller than standard narrow gauge. [source: Wikipedia]
Some common model railway scales and their corresponding track gauges.
You have Hornby Set track so it is OO scale and 16.5mm track gauge.
Some common model railway scales and their corresponding track gauges.
Common Name | Ratio | Scale in mm/ft | Track gauge (mm) |
O | 1:43.5 | 7 | 32 |
OO | 1:76.2 | 4 | 16.5 |
HO | 1:87.1 | 3.5 | 16.5 |
N | 1:160 | 1.9 | 9 |
Z | 1:220 | 1.4 | 6 |
You have Hornby Set track so it is OO scale and 16.5mm track gauge.
