Mixing locos was the norm with the Rock Island - so much so that a photo of three MUed GP38-2s was labeled as "unusual" !
Examples:
GP38-2 MUed with either a GP7, SD40-2, GP40, or a U25B !!!
Examples:
GP38-2 MUed with either a GP7, SD40-2, GP40, or a U25B !!!