guard rail

guardrail

[gahrd-reyl]
noun
1.
Also, guardrailing. a protective railing, as along a road or stairway.
2.
Railroads. a rail laid parallel to a track to prevent derailment or to keep derailed rolling stock from leaving the roadbed.

Origin:
1825–35; guard + rail1

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World English Dictionary
guardrail (ˈɡɑːdˌreɪl)
 
n
1.  a railing at the side of a staircase, road, etc, as a safety barrier
2.  railways Also called (Brit): checkrail a short metal rail fitted to the inside of the main rail to provide additional support in keeping a train's wheels on the track

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