Nostalgia & History > E Unit Question?

My question regarding EMD 'E' units is can these twin engine machines limp into a 
siding if one of the prime movers or generator fails? In other words can they move 
with one prime mover?  If so, how about the DD40 and DD35 and for that matter
how about the U50?

Yes!

Mike

they can run all day on one from what i understand not sure about the GE, never heard about that

Each engine has it's own isolation switch, both the E series and DD series. The Es had engine isolation switches at the start station for each prime mover. I believe from what I've seen of the DD series, the isolation switch for each prime mover was in the cab, I could be wrong, I've never worked on the DD series, only browsed through, but I have worked on and operated E series locomotives. I believe the Es also had a main isolation switch in the cab for the whole unit as well, it's been years since I've worked on one.

Posted from Android

In 1940, EMC built two model AB6 units units for the Rockn Island.  These were in effect an E6 B unit with only ome prime mover and powerd truck outfitted with a control cab located at the same end as the prime mover and a steam generator located at the opposite end of the unit adjacent to a baggage compartment installed in lieu of a second prime mover.
In short, an E Unit needed only one prime mover to pull itself and several cars depending of the consist weight and grades involved.
ALLEN  

I think the MoPac also had a “half E” unit with a baggage compartment in place of the rear engine.

Dave

pt199 Wrote:
-------------------------------------------------------
> My question regarding EMD 'E' units is can these
> twin engine machines limp into a 
> siding if one of the prime movers or generator
> fails?

Yes.

In other words can they move 
> with one prime mover?

Yes.

 If so, how about the DD40
> and DD35 and for that matter
> how about the U50?

Assume you mean the UP DDA40X, and DD35A units, yes, yes, and yes.

> ... limp into a siding

"Limp" may be the operative word. Suppose it's a single E unit and a 7-car train. Effectively you have two traction motors and 1000-1250 HP to work with. If those traction motors are geared high for speed and the train has to go uphill (in either direction) to reach a siding, things could get interesting. 

Along the same line, CB&Q E8’s and E9’s (and probably other roads too) were equipped with two small steam generators instead of one big one, so a one unit train would not freeze up if a steam generator failed.
BSB

Posted from iPhone

DavidP Wrote:
-------------------------------------------------------
> I think the MoPac also had a “half E” unit
> with a baggage compartment in place of the rear
> engine.
>
> Dave

Your are correct.  It was an EMC Model AA built in 1940, MP #7100.  The unit was essentially an E6A with outfitted with a baggage compartment instead of the rear prime mover.
ALLEN 

krm152 Wrote:
-------------------------------------------------------
> DavidP Wrote:
> --------------------------------------------------
> -----
> > I think the MoPac also had a “half E” unit
> > with a baggage compartment in place of the rear
> > engine.
> >
> > Dave
>
> Your are correct.  It was an EMC Model AA built
> in 1940, MP #7100.  The unit was essentially an
> E6A with outfitted with a baggage compartment
> instead of the rear prime mover.
> ALLEN 

. . . and it stayed that way until it was finally retired (whown here out of service at North Little Rock 12-31-61.  It was the last time I saw her.

Gordon

---

In contrast the Alco PA only had one prime mover. I believe the Miwaukee Road or the C&NW also had an E unit with one prime mover and a baggage compartment. Or was that not a E unit?

Victor A. Baird
http://www.erstwhilepublications.com

rock island i think

wabash2800 Wrote:
-------------------------------------------------------
> In contrast the Alco PA only had one prime mover.
> I believe the Miwaukee Road or the C&NW also had
> an E unit with one prime mover and a baggage
> compartment. Or was that not a E unit?
>
> Victor A. Baird
> http://www.erstwhilepublications.com

The C&NW unit was Baldwin DR6-2-1000 #5000-A, which had a single 1000 HP 606SC engine, unlike the other DR6 series units which had two engines.



Edited 2 time(s). Last edit at 12/12/18 18:32 by SD80MACfan.

krm152 Wrote:
-------------------------------------------------------
> In 1940, EMC built two model AB6 units units for
> the Rockn Island.  These were in effect an E6 B
> unit with only ome prime mover and powerd
> truck outfitted with a control cab located at the
> same end as the prime mover and a steam generator
> located at the opposite end of the unit adjacent
> to a baggage compartment installed in lieu of a
> second prime mover.
> In short, an E Unit needed only one prime mover to
> pull itself and several cars depending of the
> consist weight and grades involved.
> ALLEN  

I should mention that they were later upgraded and had a second prime mover and A1A truck installed in place of the baggage compartment when the Colorado Springs portion of the Rocky Mountain Rocket increased from 3 and 4 cars, which was about all the 1000 HP EMD 567 could handle.



Edited 1 time(s). Last edit at 12/12/18 18:30 by SD80MACfan.

The MILW had 2 homebuilt branchline power/baggage units that were only powered on one end. All their E units were dual powered.



wabash2800 Wrote:
-------------------------------------------------------
> In contrast the Alco PA only had one prime mover.
> I believe the Miwaukee Road or the C&NW also had
> an E unit with one prime mover and a baggage
> compartment. Or was that not a E unit?
>
> Victor A. Baird
> http://www.erstwhilepublications.com

fbe Wrote:
-------------------------------------------------------
> The MILW had 2 homebuilt branchline power/baggage
> units that were only powered on one end. All their
> E units were dual powered.
>
>
>
> wabash2800 Wrote:
> --------------------------------------------------
> -----
> > In contrast the Alco PA only had one prime
> mover.
> > I believe the Miwaukee Road or the C&NW also
> had
> > an E unit with one prime mover and a baggage
> > compartment. Or was that not a E unit?
> >
> > Victor A. Baird
> > http://www.erstwhilepublications.com

I was considdering mentioning those units in my reply but couldn't remember the exact information on them.