The G43 class was by the PRR at Altoona PA in 1966 as PRR 387326-387925. 510 cars carried their PRR number to CR becoming CR 578209-579259. These cars were renumbered around other G43's that had recieved their PC number which carried over to its CR number. 82 cars got renumbered by PC becoming PC 578150-578743 then CR 578150-578743. This group also had some ex NYC 120G class gons renumbered into open slots as well. As some G43s were either retired or renumbered into the 600000 series for coil service, CR started to renumber ex RDG GR52C class gons into vacated numbers.