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The London Underground continued to use bullhead rail after it had been phased out elsewhere in Britain but, in the last few years, there has been a concerted effort to replace it with flat-bottom rail. [15] However, the process of replacing track in tunnels is a slow one, due to the difficulty of using heavy plant and machinery.
Track relaying, using 30-foot section flat-bottom steel rail (BS 30 m) secured by Pandrol clips, [5] was well-underway in September 1989, with one-and-a-half miles of the track relaid and claims that the new railway would create about 60 jobs. [8]
An approximation of profiles of flat-bottom rail and bullhead rail, respectively the most common profile world-wide and the profile once dominant in the United Kingdom. Note: A drawing to scale is Drawing -- tramway and railway wheel and rail profiles.png. Date: SVG version: 12 April 2008. GIF version: 10 January 2005: Source
[13] [14] The 'embedded rail structure', used in the Netherlands since 1976, initially used a conventional UIC 54 rail embedded in concrete, and later developed (late 1990s) to use a 'mushroom' shaped SA42 rail profile; a version for light rail using a rail supported in an asphalt concrete–filled steel trough has also been developed (2002). [15]
Section through railway track and foundation showing the ballast and formation layers. 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.
“When life's on the line or you're trying to fix a house, you need a solution that would get the job done that's simple enough to put out there,” Nussbaum said.
Grooved rail, used when track is laid in places traversed by other vehicles or pedestrians. A grooved rail, groove rail, or girder rail is a special rail with a groove designed for tramway or railway track in pavement or grassed surfaces (grassed track or track in a lawn). The head on the right-hand side of the rail bears the vehicle's weight.
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