Find the error in this description

Here’s a sentence from Sidney Sheldon’s 1984 bestselling novel, If Tomorrow Comes, in which Sheldon describes a reproduction of the famous Orient Express.  

“The rebuilt train was a duplicate of the original, with a British Pullman car, wagon-lit restaurants, a bar-salon car, and sleeping cars.”

Can you or your students find the error that the editors missed?
If you don’t see it immediately, get out your dictionary.