Synonyms for rail

noun

1. A polelike structure

   bar, post, railing, barrier, picket, rail fence, siding, balustrade, banister, paling, rest, handrail, guardrail, grab bar, brass rail; see also bar 1, fence 1.

2. A track; often plural

   railway, monorail, railroad track; see railroad, track 1.

go off the rails*

ride on a rail