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Re: 4014 will drag a diesel to Boone July 15
Author: Hot Water
Date: 06-02-2019 - 08:43
Nudge Wrote:
-------------------------------------------------------
> It was Atk, many years ago that started the
> blended brake. They had all their "new" engines
> equipped with it BUT forgot to tell a lot of
> engineers about it. (That was when SP supplied the
> hogheads on a lot of trains.)
>
> The first time I discovered it was when I was on
> 12 & 13, SLO to SBA and return. As usual on No.12,
> you would brake from 60-70 down to 35 at West
> Santa Barb. Then you would bring the power back up
> to 50 mph until the curve just before Santa Barb
> proper.
>
> There you would hold onto a little set and drag
> them to a stop at the depot.
>
>
> Well, when I discovered the "new" Atk set up, I
> had shut the throttle to idle. Well all of a
> sudden the engine changed from power to DB without
> me doing anything.
>
> After that, when I slowed for the curve from the
> 50, I just let it do its own thing and came to a
> stop at the depot with the train bunched.
>
> It all depends on how EMD or GE installed the
> controls. I think the 4449 had its diesel controls
> installed in La Grande at EMD. I am sure someone
> knows the date. I don't even know if their
> controls had DB or it was just power.
>
>
> Nudge
The Diesel MU Control Box, designed and built by the EMD Engineering Dept. was NOT installed while 4449 was stored in EMD during June of 1975. It was quite some time later (fall of 1975?) after Doyle had encountered the problem with "helper" diesels being added by those railroads wanting to show off their own bicentennial painted diesels (specifically the MoPac), and having the helper Engineer trying to maintain speed while 4449 was attempting to slow down, in later 1975, or early 1976. As a result, the Diesel MU Control Box, plus the equipment needed to MU the airbrake with trailing units, was developed, built, and shipped out to the 4449 crew, someplace in the southwestern U.S.
The EMD developed does NOT have dynamic brake MU control capability. However, the newly developed Diesel MU Control Box developed by the Norfolk Southern Mechanical Dept. does include set-up and control of dynamic brake of trailing MU'ed diesel units.
-------------------------------------------------------
> It was Atk, many years ago that started the
> blended brake. They had all their "new" engines
> equipped with it BUT forgot to tell a lot of
> engineers about it. (That was when SP supplied the
> hogheads on a lot of trains.)
>
> The first time I discovered it was when I was on
> 12 & 13, SLO to SBA and return. As usual on No.12,
> you would brake from 60-70 down to 35 at West
> Santa Barb. Then you would bring the power back up
> to 50 mph until the curve just before Santa Barb
> proper.
>
> There you would hold onto a little set and drag
> them to a stop at the depot.
>
>
> Well, when I discovered the "new" Atk set up, I
> had shut the throttle to idle. Well all of a
> sudden the engine changed from power to DB without
> me doing anything.
>
> After that, when I slowed for the curve from the
> 50, I just let it do its own thing and came to a
> stop at the depot with the train bunched.
>
> It all depends on how EMD or GE installed the
> controls. I think the 4449 had its diesel controls
> installed in La Grande at EMD. I am sure someone
> knows the date. I don't even know if their
> controls had DB or it was just power.
>
>
> Nudge
The Diesel MU Control Box, designed and built by the EMD Engineering Dept. was NOT installed while 4449 was stored in EMD during June of 1975. It was quite some time later (fall of 1975?) after Doyle had encountered the problem with "helper" diesels being added by those railroads wanting to show off their own bicentennial painted diesels (specifically the MoPac), and having the helper Engineer trying to maintain speed while 4449 was attempting to slow down, in later 1975, or early 1976. As a result, the Diesel MU Control Box, plus the equipment needed to MU the airbrake with trailing units, was developed, built, and shipped out to the 4449 crew, someplace in the southwestern U.S.
The EMD developed does NOT have dynamic brake MU control capability. However, the newly developed Diesel MU Control Box developed by the Norfolk Southern Mechanical Dept. does include set-up and control of dynamic brake of trailing MU'ed diesel units.
