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A breather switch, expansion joint, or adjustment switch is an intentional gap in railway tracks to allow for thermal expansion in long sections of otherwise unbroken rail. . They are placed between very long sections of continuous welded rail or at the transition from continuous welded rail to jointed track, and commonly in the vicinity of bridges, viaducts and tunnels where the ...
Diagram showing the use of trap points to protect the main line at the exit of a siding An insulated track circuit interrupter fitted to trap points. Trap points are found at the exit from a siding or where a secondary track joins a main line. A facing turnout is used to prevent any unauthorised movement that may otherwise obstruct the main ...
Expansion joint on a bridge. A expansion joint, or movement joint, is an assembly designed to hold parts together while safely absorbing temperature-induced expansion and contraction of building materials.
Track geometry is concerned with the properties and relations of points, lines, curves, and surfaces [1] in the three-dimensional positioning of railroad track.The term is also applied to measurements used in design, construction and maintenance of track.
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At the junctions of train tracks, the gap in the frog or switch rail is wide. So trams can be accommodated. The main problem with a train on tram rails is the relatively narrow width of frog and switch gaps and channels of the groove rails designed to accommodate the narrow flanges of tram wheels. The wider flanges of train wheels increase the ...
A properly designed crankcase breather will also be designed in a manner that promotes the scavenging effect, or the creation of suction within the crankcase breather to further aid in the removal of blow-by gases. It is this effect that keeps the crankcase at slightly negative pressure when a properly functioning PCV system is in place. [9]
Ladder track is a type of railway track in which the track is laid on longitudinal supports with transverse connectors holding the two rails at the correct gauge distance. . Modern ladder track can be considered a development of baulk road, which supported rails on longitudinal wooden sle