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Catch points and trap points are types of points which act as railway safety devices. Both work by guiding railway carriages and trucks from a dangerous route onto a separate, safer track. Catch points are used to derail vehicles which are out of control (known as runaways ) on steep slopes.
Some railways fit catch points at the ends of crossing loops so that if a train overruns the loop, it is derailed rather than collide with an opposing train. Since the available space for crossing loops is usually limited, they do not normally have an overlap (safety margin) between the starting signals and the end of the double line.
A right-hand railroad switch with point indicator pointing to right Animated diagram of a right-hand railroad switch. Rail track A divides into two: track B (the straight track) and track C (the diverging track); note that the green line represents direction of travel only, the black lines represent fixed portions of track, and the red lines depict the moving components.
Washington Union Station in Washington, D.C., an example of a railway station A train station, a stopping point for trains, usually with passenger access Railway terminal A building for passengers at the end of a railway line Red A colour generally associated with stop, when shown by signals or flags Red zone
The train could then proceed, and a second train could follow. In the earliest days, the second train could proceed after a designated time interval, as on double lines at the time. However, after the Armagh rail disaster of 1889, block working became mandatory. Seeing the train staff provided assurance that there could be no head-on collision.
At a small number of locations on single track lines in Britain, interlaced loops had been provided where sprung catch points were required because of the steep gradient. [3] The points at either end of the loop were set according to the train's direction of travel. Trains running uphill were routed via the loop incorporating the sprung catch ...
Britain’s second largest train operator is to deploy a new device to catch fare dodgers. Northern said it will use the technology at “known hotspots” across its network.
A derail or derailer is a device used to prevent fouling (blocking or compromising) of a rail track (or collision with anything present on the track, such as a person, or a train) by unauthorized movements of trains or unattended rolling stock. [1] The device works by derailing the equipment as it rolls over or through it.