No, PRR and NYCentral merged into Penn Central. That entity and a handful of other bankrupt railroads were then swept up into a government bailout called Conrail. Conrail was then split between CSX and Norfolk Southern.
So while CSX and NS purchased assets that once belonged to PRR, they did not purchase the Pennsylvania Railway.
Thank you for your clarification of my less than totally accurate recall.
I stand corrected.