PRR GP7 Renumbering?

Model Railroader Prototype information for the modeler
1

What year did the Pennsy renumber it’s GP7s from the 8500 and 8800 series into the 5800 series?

Thanks,
Nick

2

It would have been in the year prior to the merger with the NYC so '67 or so.

3

The PRR started to renumber their fleet for the upcoming PC merger in June 1966. Sometime between June 1966 and Feb 1968 would be the possible time frame. ---- Ken McCorry