Couchette car
(重定向自Couchette)
A couchette car is a railroad car conveying basic non-private sleeping accommodation.
The car is divided into a number of compartments (typically 8 to 10) accessed from the side corridor of the car, which in daytime are configured with a bench seat along each long side of the compartment. At an appropriate time in the journey, the attendant who travels in the car (or by agreement the passengers booked in the compartment) converts the compartment into its night-time configuration with two (1st class) or three (2nd class) bunks on each long side of the compartment, creating a total of four bunks in first class and six in second class.