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Height of rail equaled width of foot for each ASCE tee-rail weight; and the profiles specified fixed proportion of weight in head, web and foot of 42%, 21% and 37%, respectively. ASCE 90 lb/yd (44.6 kg/m) profile was adequate; but heavier weights were less satisfactory.
[13] [14] The 'embedded rail structure', used in the Netherlands since 1976, initially used a conventional UIC 54 rail embedded in concrete, and later developed (late 1990s) to use a 'mushroom' shaped SA42 rail profile; a version for light rail using a rail supported in an asphalt concrete–filled steel trough has also been developed (2002). [15]
Extra heavy concrete sleepers [10] 87.8 m (288 ft 11 ⁄ 16 in) North American rail network: 1,435 mm (4 ft 8 + 1 ⁄ 2 in) Absolute minimum radius; not on lines for general service 85 m (279 ft) Windberg Railway (de:Windbergbahn) 1,435 mm (4 ft 8 + 1 ⁄ 2 in) (between Freital-Birkigt and Dresden-Gittersee) - restrictions to wheelbase 80 m ...
This does not include light rail systems that follow the BOStrab standard, with newer metro lines to use low-floor trams which have a usual floor height of 300 to 350 mm (11.8 to 13.8 in) so that platforms are constructed as low as 300 mm in accordance with BOStrab that requires the platform height not to be higher than the floor height.
It specifies the height and width of station platforms, tunnels and bridges, and the width of the doors that allow access to a warehouse from a rail siding. Specifications may include the minimum distance from rail vehicles to railway platforms , buildings, lineside electrical equipment cabinets, signalling equipment, third rails or supports ...
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.
This makes Central line trains unique on the London Underground system because, although the loading gauge of the rolling stock is the same as the other 'tube' lines, the smaller size of the tunnel requires that the positive conductor rail is 1.6 in (41 mm) higher than on all other lines.
Cast iron rails, 4 feet (1.2 m) long, began to be used in the 1790s and by 1820, 15-foot-long (4.6 m) wrought iron rails were in use. The first steel rails were made in 1857 and standard rail lengths increased over time from 30 to 60 feet (9.1–18.3 m). Rails were typically specified by units of weight per linear length and these also increased.
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