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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.
Track ballast is the material which forms the trackbed upon which railroad ties (UK: sleepers) are laid. It is packed between, below, and around the ties. [ 1 ] It is used to bear the compression load of the railroad ties, rails, and rolling stock ; to facilitate drainage ; and keep down vegetation that can compromise the integrity of the ...
The railway track or permanent way is the elements of railway lines: generally the pairs of rails typically laid on the sleepers or ties embedded in ballast, intended to carry the ordinary trains of a railway. It is described as a permanent way because, in the earlier days of railway construction, contractors often laid a temporary track to ...
As railways developed and expanded, one of the key issues was the track gauge (the distance, or width, between the inner sides of the rail heads) to be used, as the wheels of the rolling stock (locomotives, cars, etc.) must match this distance.
Too tight a 'crest' curve could result in the train leaving the track as it drops away beneath it; too tight a 'trough' and the train will plough downwards into the rails and damage them. More precisely, the support force R exerted by the track on a train as a function of the curve radius r, the train mass m, and the speed v, is given by
The trains typically operate during off-peak weekday daytime hours so as to not interfere with more frequent rush hour service. A single car weighs 45 tons. [48] The cars measure: Alignment – "Alignment is the projection of the track geometry of each rail or the track center line onto the horizontal plane," (FRA Definition). [50]
Illustration of track circuit invented by William Robinson in 1872 Track circuit transformer on the right, new axle counter on the left (Slovenia). A track circuit is an electrical device used to prove the absence of a train on a block of rail tracks to control railway signals. An alternative to track circuits are axle counters.
A Aircraft parts car Autorack Autorail Aérotrain B Baggage car Ballast cleaner Ballast regulator Ballast tamper Bilevel car Boxcab Boxcar Boxmotor Brake van C Cab car Caboose CargoSprinter Centerbeam cars Clearance car Coach (rail) Conflat Container car Coil car (rail) Comboliner Comet (passenger car) Control car (rail) Couchette car Covered hopper Crane (railroad) Crew car Contents: Top 0 ...
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