[PRCo] Re: PCC brakes

[Boris Cefer]

The fade-out range is 10 to 5 mph on early PCC models and 5 to 3 mph on 
later air cars (Pgh 1200 and subsequent). The difference is probably given 
by different values of fixed resistances in the dynamic brake circuit.
On all-electric cars the shaft brake take-over point is approximately 
between 3 and 1 mph; the speed of 0.75 mph is a point where the generated 
current reaches absolute zero.

B.

----- Original Message ----- 
From: "Fred Schneider" <fwschneider at comcast.net>
To: <pittsburgh-railways at dementia.org>
Sent: Sunday, May 27, 2007 4:22 AM
Subject: [PRCo] Re: Drum__Brakes_--_All-Electrics,__etc........

>
> My question would be why did you loose air unless you were running
> the car all the way down the hill below the threshold where the
> dynamics cut out ... say below 8 to 10 mph with most air cars.   Some
> Pittsburgh cars had extended dynamic brakes but I think they were
> mostly on 1400s and 1500s.