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| Re: LIRR needs to improve ROW maintenance; new dieseld (497806) | |||
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Re: LIRR needs to improve ROW maintenance; new dieseld |
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Posted by WillD on Tue Oct 2 21:13:22 2007, in response to Re: LIRR needs to improve ROW maintenance; new dieseld, posted by BIE on Tue Oct 2 20:51:33 2007. There would need to be a transformer in there or those silicon rectifiers would likely end up on fire. These days it's much easier to modify AC equipment to run on DC stuff because they're already equipped with the transformer and they're already working with DC. An electric loco or EMU takes in fixed frequency AC from the catenary, steps it down to a working voltage, converts it to DC, then changes the DC back into three phase variable frequency AC power for the traction motors. To make a dual-voltage AC/DC unit all you do is input the DC from the shoes or pantograph at a point beyond the AC to DC rectifier. |
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