Built by ALCO in 1955, this was 1 of 2 MP RS-3s never re-engined with EMD prime movers by Mo-Pac. Prior to the GP12 rebuild program of the 1960's on the MOP's RS3s, MP traded the a pair of them, including the 4502 (then numbered 975) and the 977 to the Bauxite and Northern for an SW1200. |