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clip and scotch : ウィキペディア英語版 | clip and scotch
To clip and scotch a set of railway points (Amer. a ''switch'') uses two pieces of equipment to temporarily lock a set of points into a particular position. 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 setting mechanisms. For infrequently used points, this guards against mechanical failure of the points leaving them in a condition to derail trains. The 'clip and scotch' method can also be used to positively deny access to the turnout or mainline. ==Scotch block== A 'scotch block' is not used, as this is a different piece of equipment clamped to a rail used to ensure that stationary railway vehicles do not move, with much the same function as chocks used to keep aircraft stationary.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「clip and scotch」の詳細全文を読む
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