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Although most three-rail systems ties the two outer rails together electrically, some manufacturers wire all three rails independently. GarGraves is a North American manufacturer of O gauge three-rail track with all of its rails insulated. Trix Express is a European manufacturer of three-rail track who insulates all three rails.
If the difference between the two gauges is large enough – for example between 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge and 3 ft 6 in (1,067 mm) – three-rail dual-gauge is possible, but if not – for example between 3 ft 6 in (1,067 mm) and 1,000 mm (3 ft 3 + 3 ⁄ 8 in) metre gauge – four rails must be used. Dual-gauge rail lines ...
Two standard-gauge cars riding on narrow-gauge trucks head the train. The Burlington and Northwestern Railway used an unknown hoist in the 1890s to run standard gauge cars on narrow gauge trucks. [20] The Cairo and Fulton Railroad (5-foot gauge) used a Nutter hoist at Texarkana in the 1870s to exchange with standard gauge lines. [21]
Original definition of Brunel's broad gauge. This rail gauge was soon changed to 7 ft 1 ⁄ 4 in (2,140 mm) [105] to ease running in curves. 2,140 mm 7 ft 1 ⁄ 4 in: South Africa East London and Table Bay harbour railways England Brunel's Great Western Railway until converted to standard gauge by May 1892, see Great Western Railway The "gauge ...
1520 mm gauge: rails 1 and 3; 1435 mm gauge: rails 2 and 4. [g] 1524 / 1435 mm (5 ft 0 / 4 ft 8 1 / 2 in). A line comprising European standard gauge and "Russian" gauge, a legacy of the former satellite states of the Soviet Union. The 89 mm difference between the two gauges is too small to allow a three-rail configuration. [h]
A Talgo gauge changing system in Lleida, Spain. A gauge changer is a device which forces the gauge adjustment in the wheels. Designs consist of a pair of running rails that gradually vary in width between the two gauges, combined with other rails and levers to perform the following steps, using Talgo RD as an example:
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.
An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.