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TGV track construction
LGV construction is the process by which the land on which TGV trains are to run is prepared for their use, involving carving the trackbed and laying the track. It is similar to the building of standard railway lines, but there are differences. In particular, construction process is more precise in order for the track to be suitable for regular use at 300 km/h (186 mph). The quality of construction was put to the test in particular during the TGV world speed record runs on the LGV Atlantique; the track was used at over 500 km/h (310 mph) without suffering significant damage. This contrasts with previous French world rail speed record (326/331 km/h in 1955) attempts which resulted in severe deformation of the track.
==Preparing the trackbed==
The work on a high-speed line (''ligne à grande vitesse'', or LGV) begins with earthmoving. The trackbed is carved into the landscape, using scrapers, graders, bulldozers and other heavy machinery. All fixed structures are built; these include bridges, flyovers, culverts, game tunnels, and the like. Drainage facilities, most notably the large ditches on each side of the trackbed, are constructed. Supply bases are established near the end of the high-speed tracks, where crews will form work trains to carry rail, sleepers and other supplies to the work site.
Next, a layer of compact gravel is spread on the trackbed. This, after being compacted by rollers, provides an adequate surface for vehicles with tyres. TGV tracklaying then proceeds. The tracklaying process is not particularly specialized to high-speed lines; the same general technique is applicable to any track that uses continuous welded rail. The steps outlined below are used around the world in modern tracklaying. TGV track, however, conforms to stringent requirements on materials, dimensions and tolerances.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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