Re: PS-1 Roofwalks
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As far as I know from a few photos and notes --
C&O 16000-16749: APEX rb
C&O 16750-16999: GYPSUM rb
C&O 17000-17999: APEX rb
C&O 18000-18499: GYPSUM rb
I have general arrangement drawings for two classes of C&O PS-1s.