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Why did the UP use such large diesels?

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  • Member since
    April 2002
  • From: Frankfort, Indiana
  • 424 posts
Why did the UP use such large diesels?
Posted by Morpar on Wednesday, March 22, 2023 8:30 PM

So I get the reasoning for a lot of railroads to use larger locomotives instead multiple locomotives in the steam era, but why did the the Union Pacific continue the trend in the diesel era? With the ability to MU diesels what was the advantage of the big double-engine units? It seems to me they would be in the same situation as articulated passenger cars and train sets, if there is an issue with 1 prime mover then the other one will go to the ship too. Granted, I like these big monsters, but I never understood the reason for them.

Good Luck, Morpar

  • Member since
    August 2003
  • From: Collinwood, Ohio, USA
  • 16,367 posts
Posted by gmpullman on Wednesday, March 22, 2023 9:26 PM

There's a little insight into UP's reasoning at the Utah Rails site:

https://utahrails.net/articles/up-dd35.php

and...

https://utahrails.net/articles/up-dda40x.php

Hope that helps, Ed

  • Member since
    January 2017
  • From: Southern Florida Gulf Coast
  • 18,255 posts
Posted by SeeYou190 on Thursday, March 23, 2023 10:09 AM

I remember a few old modelers referring to the DD40 as a "Diesel Big-Boy".

Did anyone besides Union Pacific own anything like these?

-Kevin

Living the dream.

  • Member since
    February 2018
  • From: Flyover Country
  • 5,557 posts
Posted by York1 on Thursday, March 23, 2023 11:00 AM

Entering Omaha from Iowa on Interstate 80, this display is on the hill right beside the highway.

A Big Boy and a DD40 on display.  It's worth a stop if you are traveling that way.  It's visible from the Interstate, but it's about a five minute trip getting off the next exit and going back through a neighborhood to get to the park.

 

York1 John       

  • Member since
    April 2002
  • From: Frankfort, Indiana
  • 424 posts
Posted by Morpar on Thursday, March 23, 2023 5:38 PM

gmpullman

There's a little insight into UP's reasoning at the Utah Rails site:

https://utahrails.net/articles/up-dd35.php

and...

https://utahrails.net/articles/up-dda40x.php

Hope that helps, Ed

 

 

Very interesting information! I found it particularly interesting about the study saying it cost an average of $7,000 per year no matter the particulars of a diesel. Now the strategy makes perfect sense! It would be interesting to see the UP revisit the idea with maybe the workings of an SD90. Perhaps with span bolsters again but this time use 3-axle trucks under them.

Good Luck, Morpar

  • Member since
    January 2002
  • 4,612 posts
Posted by M636C on Friday, March 24, 2023 2:35 AM

SeeYou190

I remember a few old modelers referring to the DD40 as a "Diesel Big-Boy".

Did anyone besides Union Pacific own anything like these?

-Kevin

 

The only other cutomer for twin engined main line hood unit locomotives was Southern Pacific. In 1977 I was with some friends at Colton yard south of San Bernadino when I noticed a DD35 as second unit on a transfer working. I hadn't seen the lead unit clearly.

We headed out to chase it and stopped on one of the many bridges in the area.

The train had two units, A GE U50 leading a DD35B.

Sadly my black and white camera had developed a shutter problem and the photos were unusable.

I did get two slides, however.

SP owned three U50s and three DD35Bs, but that was it, the only units not owned by UP.

Peter

  • Member since
    January 2017
  • From: Southern Florida Gulf Coast
  • 18,255 posts
Posted by SeeYou190 on Friday, March 24, 2023 11:18 AM

M636C
SP owned three U50s and three DD35Bs, but that was it, the only units not owned by UP.

Thank you for that information.

Fascinating how they were MU'd with U50s.

-Kevin

Living the dream.

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