Guard rail

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(Railroads) a rail placed on the inside of a main rail, on bridges, at switches, etc., as a safeguard against derailment.

See also: Guard

References in periodicals archive ?
Resheet the road shoulder and install new guard railing.
To promote visibility, the guard railing and gates are finished in UV-resistant, powder-coated yellow.
FAIRWAY's dedication to customer service excellence while providing the finest vinyl, composite, and aluminum porch, deck, and balcony guard railing systems has built a strong residential and growing commercial industry following.