The X59 class was built as PRR 90090-90264 by ACF in 1965. 10 cars carried their PRR numbers to CR and were renumbered CR 211051-211061. Another 42 cars that carried their PRR numbers to CR became CR 218415-218456. PC renumbered the X59's into three different series which totaled 120 cars. 11 cars were renumbered to PC 218763-218774, 95 cars were renumbered to PC 220294-220464, and 14 cars were renumbered to PC 281030-281043. The PC cars would be renumbered into the same series on Conrail.