Search results
Results From The WOW.Com Content Network
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 ...
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
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.
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.
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 ...
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 ...
One control switch (OCS) A separate switch/button is provided for every signaled route. There will be as many switches/buttons per signal as there are routes (i.e. signaled destinations) from that signal. To set the desired route, the relevant switch or button is operated. All points within the route are automatically set to the required position.
The appropriate thickness of a layer of track ballast depends on the size and spacing of the ties, the amount of traffic on the line, and various other factors. [1] Track ballast should never be laid down less than 150 mm (6 inches) thick, [5] and high-speed railway lines may require ballast up to 0.5 metres (20 inches) thick. [6]