Subject:
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Re: what is the use of a caboose?
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Newsgroups:
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lugnet.trains
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Date:
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Thu, 2 Aug 2001 16:15:21 GMT
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Viewed:
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1221 times
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In lugnet.trains, Larry Pieniazek writes:
> In lugnet.trains, James Powell writes:
>
> > Actually, flywheel is perfectly practical.
>
> Not disputing that. Just not sure that a 30K RPM graphite in an evacuated
> can with magnetic bearings is, at this moment, "perfectly" practical. Not
> just yet.
On similar lines London Underground has a proposal for (and is testing) a
scheme using flywheels mounted trackside. The principle is that current
generated by braking trains (back EMF?) drive the flywheels and accelerating
trains use the power. This reduces LU's total power consumption, spreads the
peak loadings on the sub-stations, helps reduce wear on brakes and reduces
heat build in the tunnels (which saves money in heat extraction) up from
braking.
Interestingly the fly wheels are made from carbon fibre!?! and spin at very
high speed
Tim David
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Message has 1 Reply:
 | | Flywheels in LU (was Re: what is the use of a caboose?
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| (...) Why flywheels? Why not just put the power back into the mains? (regenerative braking) US electric locos do this, I believe... In this case the flywheels seem to add a layer of complexity (and a source of loss) that isn't needed unless I am (...) (23 years ago, 2-Aug-01, to lugnet.trains)
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Message is in Reply To:
| | Re: what is the use of a caboose?
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| (...) Not disputing that. Just not sure that a 30K RPM graphite in an evacuated can with magnetic bearings is, at this moment, "perfectly" practical. Not just yet. But the notion of powering up at stops (think regular electric bus poles that instead (...) (23 years ago, 1-Aug-01, to lugnet.trains)
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