Also, guardrailing. a protective railing, as along a road or stairway.
Railroads. a rail laid parallel to a track to prevent derailment or to keep derailed rolling stock from leaving the roadbed.

1825–35; guard + rail1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
guardrail (ˈɡɑːdˌreɪl)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The purpose of guardrail is to reduce the potential for, and the severity of accidents involving vehicles that run off the road.
For anchoring guardrail, anchor cables should be drawn up tautly.
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