[PRCo] Re: Cin

[Boris Cefer]

That might work on toys and old streetcars but not on a PCC where the high
voltage and low voltage meet at some points, e.g. limit relay and overload
relay.

B

----- Original Message -----
From: "Fred Schneider" <fwschneider at comcast.net>
To: <pittsburgh-railways at dementia.org>
Sent: Tuesday, January 16, 2007 4:49 PM
Subject: [PRCo] Re: Cin


> No one has questioned it yet but before they do:  I would assume that
> the middle wire is the positive wire and the two outside wires are
> negative grounds but it doesn't matter.   Unlike model railroad
> motors with permanent magnets for a field, the trolley cars and
> trolley buses used series wound motors.   If you reversed the
> polarity of the field, you also reversed the polarity of the armature
> simultaneously and the car continued to run in the same direction.
> So reversing which wire was positive and which was negative had
> absolutely no affect.
>