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The simplified technical explanation. <br /> In the best of all possible worlds: <br /> AC traction motors over far superior low speed service and also are superior in low speed dynamic breaking mode. Thus many roads prefer them for moving heavy,low speed trains(coal) and for service in mountainous territory (CSX AC60CW's on the Boston line).Dru also correctly mentioned that AC motors are lower maintenance. <br /> DC traction locomotives are cheaper to purchase and in high speed service,offer performance comparable to AC engines. Thus UP's huge leasing of SD70M's for manifest and intermodal service,and BNSF, who for have split EMD orders between SD70MAC's for bulk service and SD75M's for fast freight.
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