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The clearance space between a train and the tunnel is often small. Pictured is a London Underground Northern line 1995 Stock train emerging from the tunnel north of Hendon Central station. A loading gauge is a diagram or physical structure that defines the maximum height and width dimensions in railway vehicles and their loads.
A related but separate gauge is the loading gauge: a diagram or physical structure that defines the maximum height and width dimensions in railway vehicles and their loads. The difference between these two gauges is called the clearance .
In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.
The standard gauge rail network in Eastern Asia is built to a minimum width of 3,400 millimetres (11 ft 2 in), and the Chinese CRH2 as well as the Japanese 0 Series Shinkansen have a width of 3,380 millimetres (11 ft 1 in). Similarly the tracks in Sweden are built to 3,400 mm (clearance SE-A and SE-B) just as the broad-gauge network under ...
CSX lists three clearance heights above top of rail for double stack service: [8] Doublestack 1 — 18 ft 2 in (5.54 m) [8] Doublestack 2 — 19 ft 2 in (5.84 m) [8] Doublestack 3 — 20 ft 2 in (6.15 m) [8] Doublestack 4 — 20 ft 3 in (6.17 m) [9] The last 2 clearances offer the most flexibility, allowing two high cube containers to be stacked.
A narrow-gauge railway (narrow-gauge railroad in the US) is a railway with a track gauge narrower than 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge. Most narrow-gauge railways are between 600 mm ( 1 ft 11 + 5 ⁄ 8 in ) and 1,067 mm ( 3 ft 6 in ).
The most common use of the term "track gauge" refers to the transverse distance between the inside surfaces of the two load-bearing rails of a railway track, usually measured at 12.7 millimetres (0.50 inches) to 15.9 millimetres (0.63 inches) below the top of the rail head in order to clear worn corners and allow for rail heads having sloping ...
The world's first operational mountain-climbing cog railway (rack-and-pinion railway), the Mount Washington Cog Railway in Coos County, New Hampshire — in operation since its opening in 1869 — uses a 4 ft 8 inch (1,422 mm) rail gauge, as designed by Sylvester Marsh, the creator of the Marsh rack system for ensuring firm traction going up ...