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A parking space commonly contains a parking chock (also known as a parking curb, parking bumper, wheel stop, parking chock, curb stop, bumper block, [2] and turtarrier [citation needed]), a barrier which is used to prevent cars from pulling too far into the space and obstructing an adjacent parking space, curb, or sidewalk.
During construction, the specific dimensions of a parking space are decided by a variety of factors. A high cost of land will encourage smaller dimensions and the introduction of compact spaces. [5] Many garages and parking lots have spaces designated for a Compact car only. These spaces are narrower than traditional spaces, thus allowing more ...
A buffer stop, bumper, bumping post, bumper block or stopblock (US), is a device to prevent railway vehicles from going past the end of a physical section of track. The design of the buffer stop is dependent, in part, on the kind of couplings that the railway uses, since the coupling gear is
A buffer stop in Italy. Dead-end sidings are often fitted with buffer stops to prevent vehicles running off the end of the track. These may consist of a simple transverse beam fixed at buffer height but the buffer stops at passenger stations can be elaborate hydraulic installations capable of absorbing a considerable amount of energy.
Figure 1 Hard wheel rolling on and deforming a soft surface, resulting in the reaction force R from the surface having a component that opposes the motion. (W is some vertical load on the axle, F is some towing force applied to the axle, r is the wheel radius, and both friction with the ground and friction at the axle are assumed to be negligible and so are not shown.
Side friction wheels: positioned on a horizontal plane, either inside or outside of the rails. These hug the sides of the rail, keeping the train centered. Up-stop wheels (also known as underfriction wheels or up-lift wheels): positioned under the rails to keep the train from lifting off of the track.