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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.
A mechanical lever frame inside the signal box at Knockcroghery in Ireland Waterloo station A signalbox, LSWR (Howden, Boys' Book of Locomotives, 1907). Mechanical railway signalling installations rely on lever frames for their operation to interlock the signals, track locks [1] and points to allow the safe operation of trains in the area the signals control.
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. To ensure that the ticket was not issued incorrectly, a book of numbered tickets was kept in a locked box, the key to which was permanently fastened to the token, or was the token.
The goods siding on a double line (in the above diagram) uses two trailing points and a diamond. It can be shunted by trains in either direction. This was widely done in New South Wales, though later on the diamond crossing was replaced with a pair of ladder crossovers; such as: Bredalabane (S) Jerrawa (S) Woy Woy (N) Newbridge (W)
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The point clip clamps the end of a moving rail (the switch rail) of a set of points to its associated stock rail, and the scotch is a timber wedge used to ensure that the other moving rail is kept away from its associated stock rail. In this way the points are fixed in either the 'normal' or 'reverse' positions and cannot be moved by the usual ...
Entire rail systems or political areas may adopt a common naming convention. In Central Europe, for example, signalling control points were all issued regionally unique location codes based roughly on the point's location and function, [3] while the American state of Texas sequentially numbered all interlockings for regulatory purposes. [4]
Interlocking is a safety measure designed to prevent signals and points/switches from being changed in an improper sequence. For example, interlocking would prevent a signal from being changed to indicate a diverging route, unless the corresponding points/switches had been changed first.