Meaning of “rail” - Learner’s Dictionary

rail

noun uk us /reɪl/
FOR HANGING [ C ] UK

a horizontal bar on the wall that you hang things on:

a curtain rail
FOR SUPPORTING [ C ]

a bar around or along something which you can hold to stop you from falling:

a hand rail
TRAIN SYSTEM [ U ]

B1 trains as a method of transport:

rail travel
a rail link
They sent the shipment by rail.
TRAIN [ C ]

the metal tracks that trains run on

→ See also towel rail

(Definition of “rail” from the Cambridge Learner’s Dictionary © Cambridge University Press)