sleeping car

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A railroad car having accommodations for sleeping.

from The Century Dictionary.

• noun A railway-car fitted with berths in which beds may he made up for passengers to sleep in.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A railroad car with sleeping facilities for passengers travelling overnight.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a passenger car that has berths for sleeping