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| Subject:
Supplying power to the London Underground trains
Category: Miscellaneous Asked by: onetool-ga List Price: $10.00 |
Posted:
26 Feb 2005 15:34 PST
Expires: 28 Mar 2005 15:34 PST Question ID: 481509 |
On the London Underground Railway there are four rails - two carry the train, and two carry the power. Both power rails are insulated from the ground at regular intervals (and from each other by a 2-3 foot gap), the 'train' rails are not, they lie on the ground. Why is it necessary to have two power rails? Bearing in mind that the two 'train' rails are earthed and could be used to complete the circuit, surely only one power rail is necessary? |
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| Subject:
Re: Supplying power to the London Underground trains
From: guzzi-ga on 26 Feb 2005 17:34 PST |
Briefly, not to pre-empt a researcher. http://www.trainweb.org/tubeprune/tractioncurr.htm#Why%204%20Rails? Best |
| Subject:
Re: Supplying power to the London Underground trains
From: lujames-ga on 15 Mar 2005 10:52 PST |
Well basicly The Positive rail is on the outside. But the middile rail is the negative. This used because if you let the return run through the running rails it can cause damage to the rails and train. I hope this helps James! |
| Subject:
Re: Supplying power to the London Underground trains
From: lujames-ga on 15 Mar 2005 10:54 PST |
Oh and heres a link to the history of one abandoned LU line which is running again. http://www.eohistory.bravehost.com Cheers James |
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