Chicago & North Western Power 1963-1995 In Color Vol. 1: General Motors Switchers & First Generation Roadswitchers. Chicago & North Western 1963-1995 Power in Color Volume 1 introduces us to the General Motors switchers and first-generation roadswitchers of the road. From the SW1 to the SW1500, MP15DCâ€™s, including the rare SW600â€™s. The SD7â€™s, SD9â€™s and SD18â€™s will be on parade, as well as hundreds of GP7â€™s and GP9â€™s. Join us in this first installment of a multi-volume documentation of the C&NW locomotive fleet.