Subject:
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Re: A question about Insulation between tracks
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Newsgroups:
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lugnet.trains
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Date:
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Thu, 15 Mar 2001 03:15:56 GMT
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Viewed:
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1045 times
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In lugnet.trains, Larry Pieniazek writes:
> In lugnet.trains, Ross Crawford writes:
> > Of course, then you have the possibility of two trains having a head-on.....
>
> I'm not sure I agree. Can you take me through it? If I have two trains on
> the same block, they will go the same direction, whether they get power from
> catenary with return through both rails, or whether they get power just from
> the rails.
>
> If I have two trains on different blocks, yes, they could head on at the
> block boundary but that's true either way.
>
> At least that's why my reasoning tells me. Nothing has changed from regular
> model railroading.
Using a catenary supply, you have (effectively) 0V at the rails, and +9V..-9V
overhead for forward / reverse. So +9V gives you forward. Whichever way the
train is facing, it'll go forward. Two trains on the same track facing in
opposite directions will both go forward, with the result left to your
imagination.
The way I picture it is with a reversing loop - you have 0V at the rails, +9V
overhead. The train enters the loop in one direction, and exits in the other,
without any change to the supply. Now imagine you started with 2 trains
separated by the length of the loop, both heading towards it....
The reason two-rail feed works is because turning an engine around effectively
reverses the motor polarity, thus as long as all motors are wired the same way,
they'll go in the same direction.
If you re-wire a Lego motor with the opposite polarity (go on!! i dare ya!!)
it'll always go the opposite direction to any other Lego train.
ROSCO
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Message has 1 Reply:
Message is in Reply To:
 | | Re: A question about Insulation between tracks
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| (...) I'm not sure I agree. Can you take me through it? If I have two trains on the same block, they will go the same direction, whether they get power from catenary with return through both rails, or whether they get power just from the rails. If I (...) (24 years ago, 15-Mar-01, to lugnet.trains)
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