[PRCo] Re: Brakes on Pittsburgh PCCs

[Boris Cefer]

Drawings do exist?

B
----- Original Message ----- 
From: "Fred Schneider" <fwschneider at comcast.net>
To: <pittsburgh-railways at dementia.org>
Sent: Tuesday, July 11, 2006 1:12 AM
Subject: [PRCo] Re: Brakes on Pittsburgh PCCs


> You don't know, however, how costly it was to make the change to  
> extended dynamic braking.   Some day we may get everything moved into  
> a new facility and have the prints conserved and then you can look at  
> the drawings and you'll know how difficult it was to make the change  
> from the original drawings for the 1200s to those shown on dwg. 7D-7720.
> On Jul 10, 2006, at 3:35 AM, prcopcc at p-r-co.com wrote:
> 
> >> Fred Schneider writes:
> >
> >> I found a rather unique document in my files that lists brake
> >> apparatus on Pittsburgh PCCs as of 6 December 1955.
> >
> >> 1230  --  1500 type trucks, 1500 type Westinghouse Motors.
> >> ...Extended dynamic braking and motor mounted drum brakes.
> >> ...Wiring changes see Drwg. No. 7D-7490.
> >
> >> 1224 to 1274 incl.
> >> ...Extended dynamic braking and Westingthouse Air Brake Co.,
> >> ......pinion mounted drum brakes.   (except car 1230).
> >> ...For wiring changes see Drwg. 77-7720 except
> >> ...cars 1225 and 1250   see Drwg. 7D-7445.
> >
> >> 1278  --  1600 type trucks, 1600 type G. E motors.
> >> ...Extended dynamic braking to 2 M/hr.
> >
> > While we don't know the dates of actual conversion from this  
> > listing  (to
> > extended range dynamics)  I questioned the change of the 1200s to  
> > same on an
> > economic basis  --  but it Does Make Sense on a practical basis.   
> > 12s had
> > spring applied friction brakes which, in early years, were not as  
> > reliable,
> > especially as drums, so extra help from EDB may be beneficial!!!
> >
> > Also interesting is that the EDB on 1278 is 2-mph.  Depending upon  
> > source
> > information, dynamics faded at just less than 3.0-mph on Air-Cars and
> > 0.75-mph on All-Electrics  --  with All-Electrics being described  
> > as having
> > EDB when built!!   PRCo 1601s also had EDB when built!
> >
> >
> >> 1505  --  1600 type trucks, 1600 type Westinghouse motors.
> >> ...Extended dynamic braking and Clark motor mounted drum brakes.
> >
> > This car was actually delivered as 1547 on 19450803 and the number  
> > switched
> > with 1505 in 1947 to keep all drum brake equipment together as  
> > 1500--1505,
> > this delivery of 1547 almost 6-months after 1564 on 19450219.  As  
> > we know
> > the original 1547 was diverted to Twin Cities so the second 1547  
> > was built
> > with and actually delivered with 1601s and after 1602 of 19450802!!
> >
> >
> > What is interesting is that a number of the entries show that the  
> > vehicles
> > have truck styles common to other PCC groups;;  this begs the  
> > question of
> > how the basic B2 is distinguished between the series?!?!
> >
> >
> >
> >
> > Jim__Holland
> >
> > I....Like....IKE__---__And....PCCs!
> >
> > down...with...pantographs.......
> >
> > UP___WITH___TROLLEYPOLES!!!
> >
> >
> 
> 
>