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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.
The diagram, which is not to scale, is a composite of various designs in the late steam era. Some components shown are not the same as, or are not present, on some locomotives – for example, on smaller or articulated types. Conversely, some locomotives have components not listed here.
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.
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
Most countries use one of the rails as the reference rail. For example, North America uses the reference rail as the line rail which is the east rail of tangent track running north and south, the north rail of tangent track running east and west, the outer rail (the rail that is further away from the center) on curves, or the outside rails in ...
A Tesla platform chassis, used for both the Model S and the Model X VW Beetle chassis, from the rear. A platform chassis is a form of vehicle frame / automobile chassis, constructed as a flat plate or platform, sometimes integrating a backbone or frame-structure with a vehicle's floor-pan.
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In the 1830s Robert L. Stevens invented the flanged 'tee' rail (actually a distorted I beam), which had a flat bottom and required no chair; a similar design was the contemporary bridge rail (of inverted U section with a bottom flange and laid on longitudinal sleepers); these rails were initially nailed directly to the sleeper.
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