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In a horizontal or vertical cable rail, the cables, once tensioned must be rigid enough to prevent a 4-inch sphere passing through it. Factors influencing this rigidity are: the tension of the cable, intermediate posts (or cable spacers) spacing, the diameter of the cable, top rail cap material and the cable to cable spacing. [7]
Rail Baltica: Standard-gauge Rail Baltica railway is under construction and is scheduled to be completed by 2026. Cost studies have been undertaken for a potential overhaul of entire rail network to standard gauge. [41] Ethiopia: Addis Ababa-Djibouti Railway; Addis Ababa Light Rail: 659 km (409 mi) Other standard gauge lines under construction ...
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 ...
Some railways, primarily in the northeast, used standard gauge of 4 ft 8 + 1 ⁄ 2 in (1,435 mm); others used gauges ranging from 2 ft (610 mm) to 6 ft (1,829 mm). As a general rule, southern railroads were built to one or another broad gauge, mostly 5 ft ( 1,524 mm ), while northern railroads that were not standard-gauge tended to be narrow-gauge.
The general standard in Germany and Switzerland had been to build new tracks with a centre-to-centre spacing of 3.8 m (12 ft) and a spacing of 4.5 m (15 ft) in railway stations. Depending on the usage of the tracks it was still possible to build new double track lines with track centres of just 3.5 m (11 ft).
Eventually the 1,435 mm (4 ft 8 + 1 ⁄ 2 in) gauge won the battle, and became the standard gauge, with the term 'narrow gauge' henceforth used for gauges narrower than the new standard. As of 2017 [update] , about 60% of the world's railways use a gauge of 1,435 mm ( 4 ft 8 + 1 ⁄ 2 in ), known as standard or international gauge [ 43 ] [ 44 ...
Track gauge conversion is the changing of one railway track gauge (the distance between the running rails) to another. In general, requirements depend on whether the conversion is from a wider gauge to a narrower gauge or vice versa, on how the rail vehicles can be modified to accommodate a track gauge conversion, and on whether the gauge conversion is manual or automated.
90-foot (27.43 m) radii on the elevated 4 ft 8 + 1 ⁄ 2 in (1,435 mm) standard gauge Chicago 'L'. There is no room for longer radii at this cross junction in the northwest corner of the Loop . The minimum railway curve radius is the shortest allowable design radius for the centerline of railway tracks under a particular set of conditions.
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