HO Gold EMD GP40 ESU LokSound DCC Sound Rio Grande #3132Details: In 1966 EMD introduced a new line of locomotives based on the 16 cylinder 645 series prime mover. The 40 series included a six axle and four axle model, the latter being the GP40. A total of 1,145 units were produced between 1966 and 1972. These turbocharged 3,000hp locomotives were used primarily in road freight service. The GP40 was a versatile locomotive that could be found across the US hauling drag freights over mountain passes and