SD90MAC: Union Pacific's Lost Locomotive
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- เผยแพร่เมื่อ 26 ส.ค. 2024
- SD90MAC: Union Pacific's Lost Locomotive! Union Pacific's SD90MAC diesel locomotive, also designated SD90/43MAC based on its horsepower rating, was arguably a failure for locomotive builder General Motors Electro-Motive Division. Originally designed to contain EMD's 6000 horsepower AC traction motor "H" engine, most of the units purchased by UP were rated 4300 horsepower following the failure of the H-engine. Few other railroads purchased SD90MAC diesels, the only other class-one railroad being Canadian Pacific. The SD90MAC quickly became obsolete with the introduction of EMD's SD70ACe. In time, UP sold or sidelined its roster of SD90MAC diesels, many being sold to Norfolk Southern for rebuilding as SD70ACU units.
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I came from an EMD family, my Uncle actually helped build the plant in the 30’s & was an original EMC hire when they opened. He is in the picture of the 1rst locomotive produced sitting on the front walkway. My Dad started there after WW2 & retired in 1977 from Locomotive test & my oldest brother was in management where he ended up being over all rotating electrical rebuild. He also was over the EMD/ Santa Fe maintenance program at Corwith in Chicago for awhile. I worked at LaGrange in the late 70’s early 80’s but got laid off like thousands of others. There were 13000 hourly employees when I worked there. It was truly a city.
An incredible time, to be sure.
The Phase 2 H engine suffered from vibration issues which caused the oil pans to crack. UP unintentionally secured the fuel tanks firmly to the under frame which caused the frame to fracture (the fuel tanks were designed to float on the frames). Lots of growing pains which were rectified in the 70 Aces. UP dumped all 6000HP locos - even the GEs.
Thank you for this insight.
@@WaltLoevyActionTrainVideos I’m retired UP electrical tech from Kansas City Neff shop. The phase 2s were based out of our facility for awhile & worked with EMD tech reps. Used to work for EMD in LaGrange & the Oakway Leasing SD60 program in North Kansas City.
Sounds like you had quite a career.
Union Pacific still has AC6000CW's on their roster and in service,they weren't ridden.All of them were rebuilt into C44ACM's with the newer 7FDL's or "GEVO-16" compliant with EPA regulations.
General Electric only built the AC6000CW's for Union Pacific and CSX,three at that that went to Union Pacific were originally going to be owned by Southern Pacific but then the merged occured and they took over the orders.
CSX is the one that sold off the CW60AC's after designating them as CW44-6's.They actually derated them down to 4,400/4,600 HP keeping the original 7HDL's.
The problems with the AC6000CW's were mainly the turbochargers.Every three months of mainline usage they had to be sent back to get new turbochargers due to fried seals or constant oil leaks causing some prime motors to go into runaway and diagnostics of back pressure.
General Electric was partnered with Deutz MKM for this.
Union Pacific owned the SD9043MAC convertibles before SD90MAC H1's & H2's because the 265H's weren't developed in time and still in process.The H motors were far worse than what GE had to deal with.
The only successful units with high horsepower (5,000 HP at that) were the 30 EMD SD80MAC's that Conrail originally owned.
The SD9043MAC's eventually were retired and put into storage while most units ended up with cracked frames.110 became SD70ACU's with Norfolk Southern before 65 were sold to PRLX.Canadian Pacific rebuilt 30 into SD70ACU's on top of acquiring 39 SD9043MAC's from Union Pacific.
GECX 6001 being one of the AC6000CW demonstrators was originally with Union Pacific for two years as UPRR 7511.For some reason it was returned to GE and repainted.It's the only AC6000CW from Union Pacific that wasn't rebuilt and still had it's original 7HDL.EMDX 8204 which was the SD90MAC demonstrator was purchased by Union Pacific and renumbered to UPRR 8504 before being scrapped just like the others.Union Pacific owned 60 SD90MAC H2's being four times of their SD90MAC H1's and all were scrapped or returned as EMDX units within a decade.Some of them became exports.Canadian Pacific had 4 SD90MAC H2's but those were also scrapped.
😳 Wow! Thanks for letting us know.
The 90s were developed during a period where GM was trying to get rid of EMD so they had hamstrung them by giving them no engineering development funding beyond what EMD could provide on their own. The AC traction systems were Siemens systems & weren’t easy to work on since the interfacing computer programs were in German & UP didn’t get much support from Siemens.
Wow!
My guess is when EMD couldn't produce as promised,
UP ran'em fried and sold for cheap.
Smart move on NS who wanted to gut anything close to a SD70
and rebuild for cheaper than new.
Glad they got rebuilt instead of scrapped.
NS sold a lot of the SD70ACU's recently. They're either going to be scrapped, or just sit around doing nothing deteriorating for years. What a waste.
Yes. How unfortunate.
All I got to say is that I really like the MAC style cab on EMD Locomotives. What I would really love to see is an EMD MAC Cowl Unit.
If EMD can make a modern Cowl unit (that Adheres to Tier 4 or Zero Emissions) it could be the EMD SDF70MAc-T4/BD (the BD stands for Bio-Diesel)
That would be a fascinating locomotive design, to be sure.
3:18 sd70ace new
Indeed!
3:17
The UP SD-90Mac's were sent back to EMD and reconfigured as a SD of another designator. Many are still in service on this date.
I don’t know about where all of them ended up, but I do know a large number of the SD-90 43mac units developed cracks in the frames at the rear fuel tank mounts and I was told they were being scrapped because of the weak frames when they left. I’m not sure that happened, but it sounds reasonable. They were made from steel that was much thinner than the frames on locomotives like the SD-70 ACe.
Yeah, I heard about the cracked frames. Thanks for giving us the details.
110 SD9043MAC's from Union Pacific became SD70ACU's for Norfolk Southern but 65 were sold to PRLX and are being scrapped.
Most of these units ended up with cracks in the frames as mentioned,which is why Union Pacific wanted to get rid of them and sold them dirt cheap,being as junked as they always were.The other SD9043MAC's that weren't rebuilt and/or purchased are either still rusting in storage or were acquired by PRLX and still remnant in storage.Canadian Pacific rebuilt 30 units into SD70ACU's and additionally purchased 39 SD9043MAC's from Union Pacific but the rest of theirs are scrapped or in storage.CEFX still owns and has leased SD9043MAC's from time to time but even those units are being scrapped for cracked frames.
Great video collection!!!! Now Norfolk Southern has bought a bunch of these , repainted and numbered them in the 7200 series 🚂🚂🚂
So I have heard.
A lot of them have been sold off recently.
So I've also heard.
UP dumped a lot of them to contrail/Norfolk southern. I saw them in
Juniata repair yards in Altoona in around 2010
Thanks for letting us know.
Outstanding catches, thanks for sharing. Dave
You're welcome ☺️
So you still use your old video camera from way back in the day? :)
That's pretty cool!
Thanks! I think so too.
Amazing stuff! Do you have videos from Greeley? Thanks for sharing!
Greeley Subdivision trains appear mostly with the Cheyenne Frontier Days train videos. You can find them in my Union Pacific playlist.
Ah yes my older brother the SD90mac even though I lasted very well he's sadly never made it.
Haha 😆
Yes!
Indeed!
should say the 9043mac, not the true mac-h!!
The noses on those MACs vaguely look like European engines - like British locomotives, or maybe German engines. My knowledge of European engines is next to nothing but these SD90s seem similar. That's some striking scenery and clever camera angles.
Thank you 😊
Conrail's SD80MACs have the same cab.
Yes indeed 😊.
Doesn’t the sd70ms and late sd60ms have the same cabs too?
They look similar to me. The beauty of the 90MAC for me is how it's oversized. Like a DDA40X, bigger than really necessary.
Pity about their demise, they sure were a handsome beast.
Indeed!
Sd90mac have crazy tractive effort
I don't know what that means.
@@WaltLoevyActionTrainVideoshe’s talking about how hard it pulls
Thanks! We put a lot of work into it.
"SD90MAC diesel locomotive, also designated SD90/43MAC"
I don't think that's accurate. It's like saying "GP40-2, also designated GP38-2".
That frame and bodyshell with a 6,000hp 16-265H engine is called an SD90MAC; with a 4,300hp 16-710 engine, it's called an SD90/43MAC. Just like the GP40-series frame and bodyshell is called a GP40-2 if it has a 3,000hp turbocharged 16-645 engine, and a GP38-2 if it has a 2,000hp non-turbo 16-645. Any given locomotive is either one or the other -- they're not alternative designations; they're different locomotive models.
Thanks for letting us know.
I love these clips well done mad props!!!! I said it before and I’ll say again they need to at least restore one of these big beasts and put it to service I’m sure the money wouldn’t be a problem since the rebuild the big boy
Indeed!