Has any maker ever made 21 inch "Pullman" Plated, Chrome, or Silver Streamlined Passenger cars??

Easy.  Just decide what color you want the stripe, then tell Callie Graphics what you want.  Easy to apply vinyl.  She makes chrome.  Silver would match painted cars; chrome for plated cars.

Mine will be 21" long, red, with thin black outline on the stripe, and silver letters with black outline (Southern Pacific).  Should have ordered a year ago - she is an artist.

I think that the short answer to your question is no, AFAIK no one has made scale length cars of the kind you mention. Back in around 2003, Lionel made some fine 15” aluminum cars that had Pullman lettering but the cars also had individual Santa Fe name plates. 

Of course that does not mean you could not re-letter and generally re-finish other 21” streamliners as Pullman cars but if you want them with a reflective imitation polished metal finish that’s a real specialist job.

Part of the reason no one has made them is around the time streamline cars replaced heavyweights, Pullman had to give up their monopoly of making and owning sleeping cars. The railroads could buy them from Pullman and other manufacturers and put their own names on them. Pullman could still staff them though.

Pete

As Norton said, there was a long drawn out legal battle between Budd and Pullman, at one point Pullman thought the lightweight cars were unsafe and refused to staff other builders cars. Eventually Budd and the railroads won out, however there was a later problem with owning their own sleepers; the national Pullman Pool would fill the void is a car was shopped for repairs etc, not so without Pullman suppling the cars.

From a molding standpoint the Pullman name would eventually only appear in the small placards at the car ends and the large panel would be the Railroad or Train name and then disappearing from the car sides in the 60's.