The track bed or trackbed is the groundwork onto which a railway track is laid. Trackbeds of disused railways are sometimes used for recreational paths or new light rail links.
According to Network Rail, the trackbed is the layers of ballast 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, 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 of passenger services.
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Famous quotes containing the words track and/or bed:
“The universe constantly and obediently answers to our conceptions; whether we travel fast or slow, the track is laid for us. Let us spend our lives in conceiving then. The poet or the artist never yet had so fair and noble a design but some of his posterity at least could accomplish it.”
—Henry David Thoreau (1817–1862)
“Now the runaways would run no more and never
again would their hair be tangled into diamonds,
never again their shoes worn down to a laugh,
never the bed falling down into purgatory
to let them climb in after
with their Lucifer kicking.”
—Anne Sexton (1928–1974)