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Unfortunately the PRR only applied that streamlining to a small handful of their K4 Pacific's.
IIRC it was four.
The K4, however was their bread and butter passenger engine, lasting later than when most roads developed 4-6-4 and 4-8-4 passenger engines.
IIRC they had 475 of that single class, more than the entire fleet of some railroads.
The successor was planned to be the T1(also pictured in this thread) with the unusual wheel configuration of 4-4-4-4. It was a duplex drive engine using two sets of power cylinders (most have only 1 set except heavy, slow freight Mallet articulated types). Unfortunately the T1 was too powerful for it's own good and had problems with traction. Only 50 T1's were built.