roomette

noun

1. (US)A small private compartment, for one person, in a railroad sleeping car.

   “Although many luxurious single-room sleepers are in service, the demand for sleeping accommodation on long journeys is so great that vehicles less weighty in proportion to their passenger accommodation, and therefore less expensive for the traveller, have become a paramount need, which is largely solved by the roomette car.”

   “The 20-hr. rail journey was, I think the most unusual and comfortable that I have ever made, because I travelled in a "roomette," a small private room for one person.”

   “For most of its journey it is made up to about fourteen cars, of which a large proportion provide the better type of sleeping accommodation (bedrooms, roomettes, etc.).”