guard rail

guard rail

1. A rail laid parallel to and inside a running rail to prevent wheels from being derailed or to hold wheels in proper alignment and keep wheels on the other rail from striking the points of switches or frogs in turnouts or crossings. 2. An additional pair of rails laid parallel to and between the running rails of bridges, bridge approaches, and at other critical locations, to keep derailed wheels on the ties and near the running rails.

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