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Rail transport - Wikipedia, the free encyclopedia (2807 words) |
 | The rails and perpendicular beams are usually then placed on a foundation made of concrete or compressed earth and gravel in a bed of ballast to prevent the track from buckling (bending out of its original configuration) as the ground settles over time beneath and under the weight of the vehicles passing above. |
| Rail transport is an energy-efficient and capital-intensive means of mechanised land transport. |
| Rail lines that carry little traffic are often built as single track, to be used by trains in both directions; "passing sidings", which consist of short stretches of double track, are provided along the line to allow trains to pass one another, and to travel in opposite directions. |
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