Subject:
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Re: Metroliner question
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Newsgroups:
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lugnet.trains
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Date:
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Thu, 21 Feb 2002 17:12:44 GMT
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Viewed:
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846 times
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<snip>
> Tranna has these too, as does SF. Electric buses are cool, especially the
> articulated ones. They can sneak up on pedestrians, you have to be on your
> toes!!!
> Of course buses use trolley poles and single wire (per pickup), rather than
> pantographs and catenary carrier/power wire pairs... but they have two
> trolley poles, drawing from two different wires, feeding both sides of the
> circuit, since it's a bit harder to return current through rubber tires than
> through steel wheels.
>
> I never figured out if they have a reverse loop problem or not, though.
>
> And it's spelled catenary, after the geometric term for the curve, rather
> than caNtenary... (that incorrectly spelled part name sure does propagate,
> doesn't it?)
</snip>
Lar, I would imagine that the busses are using A/C power which wouldn't
require an abrupt change in current flow as a DC circuit would in the
reversing loop (as long as phase A and phase B are open in the same exact
place). That way, the bus would only lose power for a split second before
it made contact again.
A---------------(end of circuit)B------------------
B---------------(end of circuit)A------------------
A/C motors typically run the same direction no matter how the circuit is
wired (unless the are reversing type motors), but that is another lengthy
discussion which has a lot more wires than 2.
-Rob
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Message has 1 Reply:
 | | Re: Metroliner question
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| (...) Well, the electric buses in San Francisco share one of their wires with the historic trolleys along Market St. I'm pretty sure the trolleys are D/C, or the tracks would represent a shock hazard, yes? --Bill. (23 years ago, 22-Feb-02, to lugnet.trains)
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Message is in Reply To:
| | Re: Metroliner question
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| (...) Tranna has these too, as does SF. Electric buses are cool, especially the articulated ones. They can sneak up on pedestrians, you have to be on your toes!!! Of course buses use trolley poles and single wire (per pickup), rather than (...) (23 years ago, 21-Feb-02, to lugnet.trains)
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