The G47's were built as PC 564950-565449 & 580100-581099 by Fruehauf during 1971 & 1972. CR 564950-565449 ex PC 564950-565449 were built with wood floors while CR 580100-581099 ex PC 580100-581099 were built with steel floors. 150 G47's were rebodied and reclassed as G52N's. 190 cars originally built with wood floors were rebuilt with steel floors and renumbered CR 581100-581199 & CR 585100-585189. Even more cars were renumbered, this time into the 600000 series for steel coil loading only.