Gordon,
CB&Q GP7, GP9, SD7, & SD9 units, (but not C&S), were built with brake
schedule 6BLQ. One of the thing that they did not have was an actuating
hose MU capability. Many were straight piped thru so that the 24RL
units would be OK on both ends. They could also not be used as trailers
behind 26L units unless the 26L units were equipped with a three position
MU-2-A valve. This caused a lot of compatibility problems after the 1970
merger.
Nose MU was not an issue. Combinations like F3AB-GP7-GP7 were
common but I can't say I ever saw a GP7-GP7-F3BA.
There were some efforts made after the merger to get this straightened
out but I don't think that they were all completed. When the GP7's left
is was necessary to pick out certain units from the NP GP9 group to
handle the Sioux City line because the bridge was not done yet. Before
that there was pretty much an all or nothing Geep policy at Sioux City.
Usually it was all CB&Q.
Keep in mind that I am not an Engineer, just a collector of information.
Russ
----- Original Message -----
From: "GORDON SMITH" <kc2bw@a...>
To: <BRHSlist@yahoogroups.com>
Sent: Saturday, 13 April, 2002 07:50
Subject: Re: [BRHSlist] Last years of the F's
> Didn't the lack of nose mu on the A units have somthing to do with this?
> (except for the couple that finally received it). I have seen pics of
> one or two A units trailing. And we used to put #6 and 24 brakes
> together on the EL. In fact our old ConRail air brake book shows how
> to hook up many combinations of #6, 24, and 26 systems.
>
> Gordon
>
> amtrak347@a... wrote:
> >
> > In a message dated 4/12/02 9:17:54 PM Central Daylight Time, vlbg@i...
> > writes:
> >
> > > In the case of the GP7/9 & SD7/9 the F's had to be in the lead
> > > because of the 6BLQ brake schedule not being compatible with
> > > 24RL.
> > >
> >
> > Russ -
> > One small correction here; F's as the leading unit account they had the
> > lowest "short time rating". Used to bellyache about having an SD-9 lead an
> > SD-45 consist but the "Cadillac" had the lower STR. My complaint was that
> > the "45's" would run in to "7/9's" when trying to dig the train out of the
> > holes in the C&I. Later on, would see the "Cadillac" on the rear of the
> > consist, "OFF-LINE".
> > Bob
> >
> --
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