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| Re: ''Oldest subway cars not being replaced afterall'' (1134988) | |||
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Re: ''Oldest subway cars not being replaced afterall'' |
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Posted by Wado MP73 on Thu Jan 26 09:05:22 2012, in response to Re: ''Oldest subway cars not being replaced afterall'', posted by randyo on Wed Jan 25 14:53:15 2012. On DC powered lines, whether overhead or third rail fed, the voltage will never be the same at every point, there will always be "drop-outs".If the voltage at the feeders is 720V and at the lowest point is 600V, it could be the reason MNR chooses the mid-point of 660V as its nominal voltage (on some docs they say 650V). And now with many of its trains using regenerative brakes, the highest voltage could be higher than the feeder voltage at points. |
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