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| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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#5
April 12th 10, 02:32 PM
posted to uk.transport.london,uk.railway
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Upgrading sub surface tube lines to 750V
Basil Jet wrote:
On 12/04/2010 14:56, d wrote: Raising the voltage does seem an odd thing to do not least because they dropped the voltage from 640V years ago citing power saving reasons (which sounds like rubbish TBH , lower voltages are less efficient , not more). ... unless the lower voltages leak less. Lower voltage means a higher current draw for the same power, and transmission losses are proportional to I^2. Rgds Denis McMahon |
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