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I am still a bit hazzy on the mechanichs of DC electricity. I know DC cannot be stepped up and stepped down like AC can, so how is power in a high voltage transmission line, say 132kv, stepped down to 3000 volts for use in a locomotive? I do know that in many railway applications, when high voltage DC is used, the motors in a 6 motor engine will be connected all 6 in serise, 2 groups of 3 in serise and finally 3 groups of 2 in serise, so the maximum voltage across each motor is never more than 1500 volts. I admire the robustness of high voltage DC applications, but I feel i have to run with the PACK and go for 25kv AC.
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