Lightweight Coaches

[NW Modeling List]

The cars that went to Chicago commuter service were renumbered into the 1000 series. In HO scale SOHO made models of 1001 and 1009. Which cars were they in pre-merger days (1964)? They are sometimes listed as P-3 class for sale but I thought they were PM cars in the 1700 series. Anyone have better information that would help?
Thanks! 
Roger HuberDeer Creek Locomotive Works
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