[PRCo] Re: Corgi model pictures and WP

[Schneider Fred]

I was thinking of the Hague.

On Jan 2, 2009, at 2:52 PM, Boris Cefer wrote:

> West European, not East European PCC.
>
> ----- Original Message -----
> From: "Schneider Fred" <fwschneider at comcast.net>
> To: <pittsburgh-railways at dementia.org>
> Sent: Friday, January 02, 2009 8:44 PM
> Subject: [PRCo] Re: Corgi model pictures and WP
>
>
> Red Arrow Brills (1941) and St. Louis (1949) cars had dynamic braking
> and blended air brakes.   There was no spotting circuit to
> continually position the accelerator drum when the car was coasting
> as there is (or was) in an American PCC.   The mechanism is the same
> as a European PCC.   They coast freely.   When you go for brake, the
> accelerator drum has to find the maximum dynamic brake position for
> the car's speed.   The only way it would be properly positioned is if
> the motorman came off power and immediately onto brake.
>
> So what typically happens is the blending valve applies air until the
> accelerator drum positions itself to apply the proper resistance and
> the dynamic brake current builds up.   Then the air is released until
> the car slows down to the point where the motors no longer generate
> any current.   Then the air comes on again to make the final stop.
>
> Explanation clear, Phil?
>
> Fred Schneider
>
>