The Collaborative International Dictionary of English v.0.48:

Pullman car \Pull"man car`\ [Named after Mr. Pullman, who
   introduced them.]
   A kind of sleeping car; also, a palace car; -- often
   shortened to Pullman.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Pullman car
    n 1: luxurious passenger car; for day or night travel [syn:
         Pullman, Pullman car]