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The track bed or trackbed is the groundwork onto which a
The track bed or trackbed is the groundwork onto which a railway track
Railway track ( and UIC terminology) or railroad track (), also known as permanent way () or "P way" ( and Indian English), is the structure on a railway or railroad consisting of the rails, fasteners, sleepers ( railroad ties in American ...
is laid. Trackbeds of disused railways are sometimes used for recreational paths or new light rail
Light rail (or light rail transit, abbreviated to LRT) is a form of passenger urban rail transit that uses rolling stock derived from tram technology National Conference of the Transportation Research Board while also having some features from ...
links.Background
According toNetwork Rail
Network Rail Limited is the owner (via its subsidiary Network Rail Infrastructure Limited, which was known as Railtrack plc before 2002) and railway infrastructure manager, infrastructure manager of most of the railway network in Great Britain. ...
, the trackbed is the layers of ballast
Ballast is dense material used as a weight to provide stability to a vehicle or structure. Ballast, other than cargo, may be placed in a vehicle, often a ship or the gondola of a balloon or airship, to provide stability. A compartment within ...
and sub-ballast above a prepared subgrade/formation (see diagram). It is designed primarily to reduce the stress on the subgrade.
Other definitions include the surface of the ballast on which the track is laid,, p. 386. the area left after a track has been dismantled and the ballast removed or the track formation beneath the ballast and above the natural ground.
The trackbed can significantly influence the performance of the track, especially ride quality
Ride quality refers to a vehicle's effectiveness in insulating the occupants from undulations in the road surface such as bumps or corrugations.
A vehicle with good ride quality provides comfort for the driver and the passengers.
Importance
Good ...
of passenger services.
See also
*Embankment (transportation)
An embankment is a raised wall, bank or mound made of earth or stones, that are used to hold back water or carry a roadway. A road, Rail tracks, railway line, or canal is normally raised onto an embankment made of compacted soil (typically cl ...
* Green track
* Roadbed
A road is a thoroughfare used primarily for movement of traffic. Roads differ from streets, whose primary use is local access. They also differ from stroads, which combine the features of streets and roads. Most modern roads are Road surface, p ...
* Subgrade
References
{{Authority control Fills (earthworks) Permanent way