From King Dictionary of Contemporary English
Related topics: Trains & railways
couchettecou‧chette /kuːˈʃet/ noun [countable] British English TTTa narrow bed that folds down from the wall in a train, or a comfortable seat on a night train or boatsleeping car
Examples from the Corpus
couchetteIt is a moment before the long hours in cramped quarters, which makes up spending a night in a couchette.She sat on the opposite couchette and picked up the paperback he had been reading.Graham tossed the paperback on to the opposite couchette and made his way to the dining car.
Origin couchette (1900-2000) French small bed