Track gauge or rail gauge is the distance between the inner sides of the heads of the two load bearing rails that make up a single railway line. Clear distance measured at a certain vertical distance below the rail table (upper surface) e.g. Europe: 14mm below, Japan 16mm below.
Types of Gauges
Broad gauge:
1.524m- 1.676m (5’ 0’’ -5’ 6”)
Standard gauge:
1.435m-1.451m (4’ 8.5’’ -4’ 9.125”)
Meter gauge:
1m- 1.067m (3’ 3.375’’ -3’ 6”)
Narrow gauge:
0.610m-0.762m (2’ 0’’ -2’ 6”)
