track gauge
spacing of the rails on a railway track
broad-gauge railway
rail track gauges wider than standard track gauge (1435 mm, 4 ft 8 1⁄2 in)
narrow-gauge railway
rail track gauges narrower than standard track gauge (1435 mm, 4 ft 8 1⁄2 in)
standard-gauge railway
rail track gauge – international standard gauge (1435 mm, 4 ft 8 1⁄2 in)
Ten and a quarter inch gauge
modelling scale
Scotch gauge
Scottish railway track width