The EMD GP15-1 is a light, and basic switching unit built
between June 1976 and March 1982. This locomotive was intended to take aim at the rebuild market. The GP15-1 is essentially a "new" rebuild locomotive, it is ideal for light-road and switching duty since it had a "Dash 1", bare bones electrical system. The locomotive is powered by a 12-645E prime mover generating 1,500 hp. 310 units were built for US railroads. Many GP15-1's remain today. Union Pacific has the largest fleet since it inherited MoPac, and CNW's rosters, as well as Conrail. Many units are on shortlines or with leasing companies.