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 Post subject: Re: EMD Model 40's
PostPosted: Mon Oct 02, 2017 7:55 pm 

Joined: Fri Mar 26, 2010 11:43 am
Posts: 432
Location: Floyd, AR
atsfm177 wrote:
Horsepower ranged a lot too depending on being simply supercharged (all 71 series engines are 2-cycle so must be supercharged) or turbo-supercharged and what size injector is installed.
Greg


They are NOT supercharged. They have a scavenging blower. The blower is not intended to provide higher then atmospheric pressure to the cylinder. It is required to blow out the spent combustion gases and trade them for fresh air. Later, in the 50's and 60's and beyond, those same blowers were modified to fit on gasoline engines where they did in fact become superchargers.

You count your rivets, I count mine ;)

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 Post subject: Re: EMD Model 40's
PostPosted: Mon Oct 02, 2017 8:32 pm 

Joined: Tue Aug 02, 2005 1:25 pm
Posts: 5023
Thought I would post a photo of the Model 40 at North Judson. Had a young member who took an interest in the unit a number of years ago, and he got one of the Detroit's fired up and moved it up and down the track until he was told to abandon the effort because he was making too much smoke. The unit is now strictly a display at Hoosier Valley.

Les


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EMD Model 40 at HVRM July 2013 001.JPG
EMD Model 40 at HVRM July 2013 001.JPG [ 284.34 KiB | Viewed 1084 times ]
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 Post subject: Re: EMD Model 40's
PostPosted: Mon Oct 02, 2017 9:48 pm 

Joined: Mon Aug 23, 2004 5:10 pm
Posts: 956
The Walkersville Southern tourist operation in Maryland has one of these beasties, and at least the last time I was there, it was running.


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 Post subject: Re: EMD Model 40's
PostPosted: Tue Oct 03, 2017 8:16 am 

Joined: Tue Aug 24, 2004 3:07 pm
Posts: 642
Definitely Detroit/GM 6-71s under each hood.

Model 40 Operator's Manual shows weight ready for service as 81,000 lbs.

EMD rates total HP as 300. Possibly because lower than max RPM (to match the same generator as used on SW1) reduced output accordingly.

How many of the 11 built remain intact today?


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 Post subject: Re: EMD Model 40's
PostPosted: Tue Oct 03, 2017 10:19 am 

Joined: Tue Sep 22, 2015 12:36 pm
Posts: 184
atsfm177 wrote:
Alexander D. Mitchell IV wrote:
Acciording to Critters, Dinkys & Centercabs by Jay Reed, the eleven Model 40s built had a pair of GMC 6-71 engines running a common generator under the cab--one spun left-handed and the other right-handed, so it was a common power train--"this was a celebrated feature of the 71 series (their engine blocks were entirely symmetrical, so that the output end could be either end)."

The 6-71 is a 7-liter inline six rated for 238 hp, according to Wikipedia, which also says the 71 series was discontinued by GM in 1995.


The 71 series was probably one of the most versatile families of engines being produced in everything froma 2-71 inline up to a V-24. Even in the 6-71 variant there was probably a dozen or more setups with RH and LH rotation, Exhaust on Right or Left, supercharger on RH or LH.

Horsepower ranged a lot too depending on being simply supercharged (all 71 series engines are 2-cycle so must be supercharged) or turbo-supercharged and what size injector is installed.

The engines in Travel Town's Model 40 are rated at 150 HP each giving a total HP of 300 when both engines are installed and running. As stated above, there is a single generator spliced between the two diesel's and a belt driven air compressor driven from the back side of the main generator.

Electrical system is 32v.

It has a linear throttle so there are no notches as in a road locomotive and no MU capability.

Greg


The GMDH-3 resides at the Southern Michigan Railroad Society in Clinton, Michigan to be exact. Currently stored out of service but accessible in our yard.

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 Post subject: Re: EMD Model 40's
PostPosted: Tue Oct 03, 2017 11:37 am 

Joined: Sun Aug 22, 2004 12:15 am
Posts: 460
atsfm177 wrote:
Alexander D. Mitchell IV wrote:
Acciording to Critters, Dinkys & Centercabs by Jay Reed, the eleven Model 40s built had a pair of GMC 6-71 engines running a common generator under the cab--one spun left-handed and the other right-handed, so it was a common power train--"this was a celebrated feature of the 71 series (their engine blocks were entirely symmetrical, so that the output end could be either end)."

The 6-71 is a 7-liter inline six rated for 238 hp, according to Wikipedia, which also says the 71 series was discontinued by GM in 1995.


Am I interpreting this correctly, even though you have 2 prime movers, there is no way to disconnect one engine? So you really running a split block 12-71... I wonder was this done to balance the axle weight or because the 6 cylinder engines were more common?

Rich C.


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 Post subject: Re: EMD Model 40's
PostPosted: Tue Oct 03, 2017 2:24 pm 

Joined: Tue Aug 24, 2004 3:07 pm
Posts: 642
Both engines are mechanically connected to the generator. If only one is running, the other is "going along for the ride."

Perhaps EMD's designers chose the 6-71 for its commonality and were influenced by the many centercab designs by various other builders.


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 Post subject: Re: EMD Model 40's
PostPosted: Wed Oct 11, 2017 6:59 pm 

Joined: Tue Mar 21, 2006 12:17 pm
Posts: 91
Location: walton, ky
Here’s the updated photo of 2284:


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 Post subject: Re: EMD Model 40's
PostPosted: Thu Oct 12, 2017 10:12 am 

Joined: Thu May 06, 2010 10:30 pm
Posts: 611
Location: Bucks County, PA
G. W. Laepple wrote:
The Walkersville Southern tourist operation in Maryland has one of these beasties, and at least the last time I was there, it was running.


I can confirm that the Walkersville crew does have one, and as of three years ago, at least, it was running. How do I know?

https://youtu.be/yuIxZ6dfiDc

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 Post subject: Re: EMD Model 40's
PostPosted: Thu Oct 12, 2017 10:53 am 

Joined: Tue May 30, 2017 4:27 pm
Posts: 1
bigjim4life wrote:
G. W. Laepple wrote:
The Walkersville Southern tourist operation in Maryland has one of these beasties, and at least the last time I was there, it was running.


I can confirm that the Walkersville crew does have one, and as of three years ago, at least, it was running. How do I know?

https://youtu.be/yuIxZ6dfiDc



It is Walkersville primary engine on our regular trains. It is great little engine... when it's not Raining.


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 Post subject: Re: EMD Model 40's
PostPosted: Fri Oct 13, 2017 3:22 pm 

Joined: Fri Mar 05, 2010 3:41 am
Posts: 3054
Location: Inwood, W.Va.
Here's something amazing to me--of the 11 units built, 8 are still around, some still in commercial service.

And if I counted right, six of the eight are accounted for this this thread.

https://en.wikipedia.org/wiki/EMD_Model_40


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 Post subject: Re: EMD Model 40's
PostPosted: Sat Oct 14, 2017 10:20 am 

Joined: Sun Aug 22, 2004 5:55 pm
Posts: 688
Location: Warren, PA
The ex-AMF unit in York has the hoods and access panels open for inspection, a well as the cab open with stairs into it. Peering under the cab deck I could see the single generator with the two shafts into it....nah, couldn't be. I'm missing something here.... they couldn't have done it that way...

Huh!

Correction on my previous post, the TRAINS salute to the EMD Model 40 was in the September '72 issue (EMD special) and the article was "Occasional Violations" with the AMF Big Bill unit getting a two-page spread. It was based on the violation of EMD's standard principle - standardization - and how nothing before, after, or since was quite like the EMD 40.


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