[PRCo] Re: Corgi model pictures and WP

[Schneider Fred]

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


On Jan 2, 2009, at 2:16 PM, Phillip Clark Campbell wrote:

> Mr.Rockwell;
>
>
> Is the destination sign actually back lit?  Or is it a reflection
> of the flash?  Looks effective.  W-Library.
>
> I now see what looked like a 'Detroit' PCC in another photo
> is actually a WP PCC.  The turn it is negotiating is great
> because of the truck angle;  looks good.
>
> I often thought that the Brill and St.Louis PCC-like
> equipment ordered by Red Arrow would be ideal for
> WP.  Although very flat on the end I tend to favor the
> Brill because the front windows are so large;  motormen
> may not have liked the glare however.  By the time the
> St.Louis cars appeared, WP was sure of abandoning.
> But had WP stayed on the cars could have fit their
> operating practice by being all-electric!  Would be much
> easier for the operators as they wouldn't have to wind
> up the tread brake to complete the stop.
>
> Question:  Did the Red Arrow Brills and St.Louis cars
> utilize dynamic braking?  I rode them only once and
> didn't pay attention to that detail.  'Seems' they were
> straight wheel tread brake shoe cars.
>
>
>
> Phil
>
>
>
>
>
>
> ----- Original Message ----
>> From: ROBERT R ROCKWELL <w3syt1 at msn.com>
>> To: pittsburgh-railways <pittsburgh-railways at dementia.org>
>> Sent: Friday, January 2, 2009 8:34:25 AM
>> Subject: [PRCo] Fw: Corgi model pictures
>>
>>
>>
>> Corgi versions with monitor roofs are getting more expensive
>> all the time, it  seems. I think the last batch was "Toronto"
>> (Pgh repaints). These are about $70 at PA Heritage.
>>
>>>
>>> Robert Rockwell
>>> w3syt1 at msn.com
>>>
>>
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