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A railroad tie, crosstie (American English), railway tie (Canadian English) or railway sleeper (Australian and British English) is a rectangular support for the rails in railroad tracks. Generally laid perpendicular to the rails, ties transfer loads to the track ballast and subgrade , hold the rails upright and keep them spaced to the correct ...
Cribbing is usually accomplished with blocks of wood, often 4×4 (3 + 1 ⁄ 2 in or 89 mm) or 6×6 (5 + 1 ⁄ 2 in or 140 mm) and 18–24 in (460–610 mm) long.Soft woods, like spruce and pine, are often preferred because they crack slowly and make loud noises before completely failing, whereas stiffer woods may fail explosively and without warning.
A railway track (CwthE and UIC terminology) or railroad track (NAmE), also known as permanent way (CwthE) [1] or "P Way" (BrE [2] and Indian English), is the structure on a railway or railroad consisting of the rails, fasteners, sleepers (railroad ties in American English) and ballast (or slab track), plus the underlying subgrade.
Interest in concrete railway sleepers increased after World War II following advances in the design, quality and production of pre-stressed concrete. Chaired bullhead concrete sleepers have been around since at least the 1940s; the Great Western using a two-holed chair, thus saving both scarce wartime timber and steel fixing bolts. [4]
Y-shape steel sleepers (left), versus straight steel/wood sleepers (right) Y-shaped steel sleepers (German: Y-Stahlschwellen) are a type of railway sleeper designed to support railway track with a rail fastening system at with three points of contact.
Unimog pushing a "Spindle Precision Wrenching Unit" used for automatic and synchronous tightening and loosening of rail fastenings Mabbett Railway Chair Manufacturing Company share certificate (1867) A rail fastening system is a means of fixing rails to railroad ties (North America) or sleepers (British Isles, Australasia, and Africa).
In 1907 BAT Co applied for permission to build a forest railway for the transport of logs to the sawmill and began in the same year, shortly after obtaining the approval, with the construction track. BAT Co laid steel rails weighing 17.4 kg/m (35 lb/yd) onto wooden sleepers made of locally harvested and sawn hardwood.
Deodar is the most important timber tree providing soft wood. It can be easily worked and it is moderately strong. It possesses distinct annual rings. It is used for making cheap furniture, railway carriages, railway sleepers, packing boxes, and structural work. Gambar Gmelina arborea: Pale yellow 580 kg/m 3: 980 lb/cu yd Central India, South India