"At the time one rather resented Sleeping Car to Trieste for being a remake of Rome Express, and for keeping the original off the market. Now that the original is available again, one can accept the second version on its own breezy and very entertaining terms, although of course its storyline--tangled lives straightened out and a murder solved during a train journey--had been copied many times in the intervening years, and was no longer such a novelty. Too, much of the appeal of the original was vested in its strong cast, and Conrad Veidt, Esther Ralston et al were rather more interesting passengers than their parallels in version No. 2. Nevertheless, this kind of lightly comic romantic melodrama has so disappeared from current cinema that it's almost as enjoyable a visitor from the past as its ancestor." William K. Everson