Conrail rostered a wide variety of coil cars. Their fleet was originally composed of cars of EL, RDG, NYC, PRR, and PC origins, and was augmented by several groups Conrail purchased over the years. Conrail even designed their own Coil cars, the distinctive CoilSHIELD series.
The G42E class of coil cars were built for the Rock Island as ROCK 955000-955024 by SEICO in 1977. Cars were acquired by CR in 1980 and renumbered to CR 627900-627924 in order.