A Pullman bed is a type of bed that is typically found in train cars. It is a narrow bed that is usually stacked on top of another bed, and is often used to save space. The term 'Pullman bed' comes from the Pullman Company, which was an American railroad car manufacturer that first introduced the beds in the late 19th century. The crossword solution for this term is 'BERTH', which is a nautical term for a sleeping compartment or bed.