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At 250 km/h the tracks have a centre-to-centre distance of 4.5 m (15 ft) (while the first tracks in the 1980s were built with a distance of 4.7 m (15 ft)). The TGV track construction puts both rail tracks into a common concrete block, so they can disregard a safety margin for track displacement.
The track centres can be as closely spaced and as cheap as possible, but maintenance must be done on the side. Signals for bi-directional working cannot be mounted between the tracks, so they must be mounted on the 'wrong' side of the line or on expensive signal bridges. For standard gauge tracks the distance may be 4 metres (13 ft) or less.
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 ...
Track gauge or rail gauge (also known as track gage in North America [8]) is the distance between the inner sides (gauge sides) of the heads of the two load bearing rails that make up a single railway line. Each country uses different gauges for different types of trains.
A railway or railroad is a track on which the vehicle travels over two parallel steel bars, called rails. The rails support and guide the wheels of the vehicles, which are traditionally either trains or trams. Modern light rail is a relatively new innovation which combines aspects of those two modes of transport. However fundamental differences ...
Platform gap – Space between a train car and the edge of the station platform; Platform gap filler – Movable platform edge extensions at subway or railway stations; Railway platform height – Vertical distance between top of the platform and top of the rail; Rail transport – Mode of transport
The first tracks in Austria and in the Netherlands had other gauges (1,000 mm or 3 ft 3 + 3 ⁄ 8 in in Austria for the Donau Moldau line and 1,945 mm or 6 ft 4 + 9 ⁄ 16 in in the Netherlands for the Hollandsche IJzeren Spoorweg-Maatschappij), but for interoperability reasons (the first rail service between Paris and Berlin began in 1849 ...
A broad-gauge railway is a railway with a track gauge (the distance between the rails) broader than the 1,435 mm (4 ft 8 + 1 ⁄ 2 in) used by standard-gauge railways.. Broad gauge of 1,520 mm (4 ft 11 + 27 ⁄ 32 in), more known as Russian gauge, is the dominant track gauge in former Soviet Union countries (CIS states, Baltic states, Georgia, Ukraine) and Mongolia.