[PRCo] Re: More Thoughts on 1600s versus 1700s

[Jim Holland]

Good Morning!

> Fred Schneider wrote:

> I went back to the equipment chart in the PCC book ...
> the easiest way to determine blown motors is on
> GE cars because that apparatus supplier changed the
> motor number.  Their 1198 motors were internally fan
> vented, while the 1220 weries were blown motors. 
> The first cars in Pittsburgh with GE 1220 motors were
> 1675-1699.  . 
> If you have the first edition of PCC From Coast to Coast,
> there was a fold-out chart in the rear.  It did not appear
> in second edition (I think Mac was trying to save money).

	Actually in  *PCC The Car That Fought Back.*

> ...You'll find that the 1600 had 1432J, cars 1601-1975 had
> 1432HE and 1700-1775 had 1432K........
> How were the motors on the 1600s ventilated.......
> I apparently found evidence that the 1600s had a
> PC2 compressor,  which had to be driven off a pulley
> on the MG set.    This suggests that the other end
> drove a single fan to cool both the resistors and
> the motors, and to heat the car.

	VERY  Interesting.    Apparently associated the move from Truck-Level
air-intakes to Roof-Level air-intakes to Also mean Forced-Air (Blown)
Ventilation   ---   but after reviewing the charts as you suggested, I
Now see that All That Changed was the source of the air!   
Truck-Level air source allowed for dirt stirred up by car movement to
be drawn into the motors so Air-Source was changed to roof level!

	So the 1600--1799 cars were the Only PRCo Cars with Forced-Air
(Blown) Motor Ventilation  --  all other cars used Motor-Mounted Fans
for ventilation.

	Cooling of motors must not have been a real problem since
Forced-Ventilation came along so late in the game.    Maybe this
development was held up by the war as well.

	Thank You for taking the time to clarify this Information.

> Please note that all-electric cars do not
> require standee windows.

	Good Heavens   ---   A Given!    How did Windows get introduced into
Electrical specifications?!?!(:->)


A reminder (how often do you need the Reminders?!)


Assignment__For__FWS3:::::::

        Next time at PTM, please check the spare PCC trucks.
B2Bs have an obvious cradle welded to the tube frame for
holding the Rubber--Spring  bolster.
	**-PCC The Car That Fought Back-**  pg.128 shows
3-photos of the  *Demonstration__B2B*   ---   with clear
photo of cradle.    If there are any spares with the
WAB drum actuator, a check of the bolster mount will
be revealing.

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James B. Holland

Holland  Electric  Railway  Operation....... 
___"O"--Scale St.-Petersburg Trams Company Trolleycars and...
______"O"--Scale  Parts  mailto:pghpcc at pacbell.net

______Pennsylvania Trolley Museum http://www.pa-trolley.org/
___Pittsburgh  Railways  Company  (PRCo),   1930  --  1950
N.M.R.A.  Life member #2190; http://www.nmra.org

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