[PRCo] Re: Pittsburgh 1200s

[Boris Cefer]

No! there WAS one pull rod (... and brake cylinder ... and air tank) on each
axle. Jim was correct.

B

----- Original Message -----
From: "Boris Cefer" <westinghouse at iol.cz>
To: <pittsburgh-railways at dementia.org>
Sent: Tuesday, April 04, 2006 9:28 PM
Subject: [PRCo] Re: Pittsburgh 1200s


> Yes, the photo came from me.
>
> As I understand this design, there was one lever (pull rod) on each truck.
> The small air tank was only an auxiliary tank. When the cylinder was under
> full pressure (tread shoes released), the check valve (the bottom one)
> allowed the pressure to fill the auxiliary tank. When it was necessary to
> release the brakes in an emergency (no pressure in brake cylinder and
> connecting pipes), pulling the rod opened the upper valve which allowed
the
> pressure to enter the brake cylinder and release tread shoes. Of course,
the
> valves had to be perfectly tight to keep sufficient pressure in the small
> tank for a sufficient period of time.
>
> B
>
> ----- Original Message -----
> From: "Holland Electric Rwy. Op. H.E.R.O. -- Import SPTC 1.48 Models //
> James B. Holland"
>
>
> > I believe that Boris provided us with this photo of the 1200 truck and
> > brake system:::::::
> >
> >
> > http://lists.dementia.org/files/pittsburgh-railways/1200s%20brake.jpg
> >
> >
> > Assume that lever near the bottom right which runs toward the cylinder
> > near the upper left is the one that is pulled to release the brake
> > ----    also assume that this must be done on each axle.
>
>
>