[PRCo] Re: Brakes on Pittsburgh PCCs

[Fred Schneider]

Message deleted.

On Jul 11, 2006, at 12:02 AM, Boris Cefer wrote:

> 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!!!
>>>
>>>
>>
>>
>>
>