For a in depth look at this type of locomotive, both inside and out see my other video here kzfaq.info/get/bejne/e7h-mN16z8qRd3k.html

The UP really takes the saying "go big or go home" to the next level

I love the wail of the turbos. As with many of the big, slow turning diesels, you can hardly hear the engine itself, only the turbochargers! What a machine!

This is the Big Boy of the diesel world..... wow

My father road this rail for 33 years RIP Pop.

By the sound, outward appearance, and clean exhaust, obviously impeccably maintained.

That's one of the coolest sounds ever when it revs up. Thanks for sharing this.

Imagine being the engineer operating this absolute monster of a machine

Oil companies : how many tons of Diesel do you want sir? This DD40x: yes..

Anyone else hear the 844 having a good time blowing her whistle? good to hear her again and see this legend.

Wanna see this and 4014 pull an 8 mile long train like an absolute boss. So much power.

It's actually the Roar from the turbos than the actual engine itself the sound clearly justified it's massive power its treat to hear.. Love from india♥️♥️♥️

I work for Progress Rail and EMD prior to the company name change; also work in North Platte and seen these operate prior to this fleet their retirement. The 47 were built from 1969 - 1971and built at the request of Union Pacific in honor and celebration of the 100th anniversary of the laying of the Golden spike and essentially the 100th year operation of Union Pacific. UP also wanted these locomotives to be 100ft long from the front coupler to the rear coupler, but due to the constraints of the manufacturing plant in La Grange, IL, they could only be built 98 ft long. The fleet averaged 22,000 miles per month during the 1970's era as I have been told with some accumulating almost 24,000 miles per month. During that era, there would be a 4 unit consist. The consist was made up of 2 of these on either end with 2 SD40-2's in the middle of the consist. The Centennials would be connected such that the rear Centennial would be facing in the opposite direction of the front Centennial which would not require the consist to be turned. These would run from North Platte, NE to the west coast, primarily Los Angeles and then return. As the trains would come within 30 miles of their termination, the dispatcher would call and ask the crew how the consist was performing. If there was not a problem, there would be plans made then to quickly fuel and service the consist, and route them in the yard so that they could be used for the next train going in the opposite direction. These have 8200 gallon fuel tanks, essentially being two four axle locomotives on the same underframe. These accumulated in the neighborhood of 2,000,000 miles before retirement. These locomotives had a lot of equipment that are either unique to this particular model or experimental in nature which eventually became standard equipment. There is the UP6922, which is the road number that is used for the model train sets. The locomotive with that road number is in a city park at North Platte and resides along side of the UP3985, the one and only UP Challenger steam locomotive on display in the world.

This is a very impressive diesel locomotive model, the DDA40X is the largest diesel locomotive ever constructed and produces the highest amount of horsepower of any single diesel unit at 6600 hp. Union Pacific rr had an impressive roster of historic steam/ diesel locomotives that were large in size and power output, which made them a unique & interesting railroad company.

It's basically 2 locomotives on one frame. Imagine having to run that thing long hood forward.

Who would have thought that 2019 will again be a big boy on the rails.

Those old EMT diesel engines sound so good! I remember watching these "double century" units running up and down Cajon Pas in the mid-1970's. It's great to see one still in operation.

I dig the horn. Like an old Steamer. This is a diesel incarnation of a BigBoy. ; ] Fitting that it's Union Pacific.

Awesome! Seeing the largest most powerful diesel locomotive ever built.But hearing 2 645 V16s is even more amazing! Glad Union Pacific preserved and uses one of these EMD behemoths for excursion service!

Swinging 260 tons like a champion..

That turn table could use some WD40 !!

I remember seeing this behemoth rolling north through Kent, WA, many years ago. Once seen, never forgotten. I climbed all over another in Portola, CA. All you can do is shake your head at the kind of audacity that would create such a machine.

Wow. She's a big girl. "Yes, the force is strong with this one."

This 2 stroke beast is turbocharged and superchaged! Amazing engineering. Only in America!!!

I am in awe of people that are capable of designing and building big beautiful beasts like this.

What an absolute behemoth! Hearing the loud horn and the engine sound gave me the chills. Thank you for the upload. Greetings from India :)

Me Railfanning: Me: oh I hear a locomotive, think its a CSX GP40-2. Train: (comes around the corner) Me: HOLY SHIT!! THE HELL IS THAT??!!!

I rode on one...my Grandfather and uncles all passed now worked all there lives for union pacific...they all died wealthy...railroad treatment was really good.

We still use there smaller GM cousins in Ireland. Over 40 years old and all are still operating 👍

In my opinion he still has the most beautiful "cab looks" ever designed on a locomotive.

I am pleased to see this...part of my old home town.. and even worked in the Roundhouse behind the turntable... Cheyenne.. Live the Legend... My Late Brother In Law William Bill Riley Sr operated out of Cheyenne and North Platte Nebraska... he is also Posthumously received the Rare and Prestigious Golden Spike Award!!

A Beast...grew up around trains...dad worked 4 railroad, husband working on trains....loves the sound....lady loves trains...

Puts our British Diesels to shame, that’s a great locomotive.

As much as I love steam locomotives. The diesels seem alive too. Mechanical beasts of awesome power.

Wow thats some locomotive. I've never seen an 8 axle one before. I imagine that beast can pull thousands of tons of freight easily.

Love those Centennials. Watched them many times in late 60's pulling hauls out of Los Angeles.

My Favorite locomotive! Such an awesome honor to see one working and sounding perfect!

Seeing the steam locomotive at the end was quite the surprise as a little contrast

You could power a small town with that engine . 👍👍👍👍😁😁😀😀😀😀😁

That is a massive muscle of locomotive. Impressive machine.

That UP car....it's not a toy. Its actually quite large in fact, but the DD40AX.....dwarfs it. Stunning🇺🇸

Spectacular to see the big boy running again....Now for our next project...

Looks like a 2-in-1 loco! Very impressive piece of engineering!

YOU BETTER BELIVE IT!SHE IS STILL A CLASSIC DIESEL!AND FOR HER TO STILL BE RUNNING AFTER ALL THESE YEARS, IS TRULY AMAZING! SHE LOOKS GREAT ,AND SHE SOUNDS GREAT,TOO!

I guess this old girl has been rebuilt more than once. I grew up on a main east west line of UP through the Arkansas River Valley next to the tracks. We even had the original rail bed left over from the 1800s line on our land near the river. I am glad that she is still around. I was built in 1968.

I was fortunate enough to catch this motor on a VIP special, SAVBL-14 in 2008. From Parsons KS to McAlester OK. (MK386 to MK566). It was quite the ride. This thing will cruise at 70mph with little to no effort. However, I have to say it is the roughest riding motor I've ever been on to date. This thing will beat you to death.

That beautiful 645 sound brings me back to my childhood

the most wonderful locomotive ever built! respect that it is preserved in working condition. I love to run in in Train Simulator

That's a BEAST!

Finally got my hands on one of these in N scale. Should get some interest at my club!!

This thing is actual AmericanMuscle. Its not just any machine its a beast.

UP's Diesel Big Boy! Wow! What a great beast. Thanks.

It's interesting to see a railroad turntable in action. I didn't think that there many of them left.

Its good to see its still kept in running condition. While it would make an awesome museum piece, its better to see it in action.

That's one big mother of a Locomotive ,Size is everything looking at this big behemoth of a beast of US Traction 😮Wow ❤️❤️🇬🇧❤🇺🇲

cool to see it running

That must be some feeling sitting up in the cab of that machine damn.

God damn that's a pleasant sound.

I'm impressed but still in love with the Big Boy. 😊

This sound is so soothing. If I ever wake up too early, this helps ease me back to sleep 🙂

idk why I hear the Thomas and friends turntable song in my head while its spinning....and watching James spin like a top. lol.

Looks and sounds intimidating .... that humming of the engine

I searched for a video with this locomotive by itself so that I could hear it ! I just LOVE that throaty growl. It gives me goosebumps. Thanks so much for letting me hear it . Aarre Peltomaa

This is my absolute favorite locomotive from the new era thank you very much for posting

Don’t you think that is a bit overkill for moving a baggage car around a yard?

I have been fortunate to be able to see it during Depot Days in Cheyenne. A operational gas turbine would be nice, as would be an operational GE U-50, although I do not know if any of those were saved. I am surprised that no one has mentioned the steam whistle from UP 844, which you can see, as the Centennial is backing past the steam shop.

That bad boy is huge!!!

Without question my favorite locomotive. On my bucket list to see

Really cool hearing 844 moving around in the background, too.

Holy shit I thought this thing was a myth it's like 2 units in one

I love these machines, they are incredible ….

so good to see , i used to work on the UP M&W , and see consist of 6900 - SD45- 6900 what a sight it was never forgot it

Best looking loco ever built.

I believe the Illinois Railroad Museum in Union, Illinois has one of these beautiful giants in their collection

Wow! My Uncle Drove Trains Out Of Pennsylvania For Years ! He Was A Engineer For ConRail Back Then! These Are Beautiful Trains ! Enjoy Them For the Company! Be Strong! Be Safe! Be Healthy! God Bless!!

Very cool. Big locomotive big sound. Beautiful turntable. Sounds bad ass!!

My favorite diesel locomotive

One of the most interesting jobs in Locomotive maintenance was spinning engines on the turntable, if you screwed up, you'd know about it.

Thank youi UP for preserving this example of engineering. I wish that a working GTEL was still around..

I love the sound of those diesels and turbos. Damn.

Begob, I remember visiting the Cheyenne turntable in 1957, my grandfather worked there for 40 years.

I am so pleased that this milestone engine is still in operation. Now all we need to do is to get one of those gas turbine engines going too. These are the sorts of things that DID make America great.

I live right in front of a train station, with train tracks almost in my backyard with a fence, not wooden, separating my yard from the tracks. I legit have to speak louder whenever a train comes by and blared the horn almost right in front of my house when I speak to someone smh. It's also how I became immune to most noises hearing the train horns at 4 am😅

I can watch this stuff all day we put our sound system on every time and would give anything to ride on her for a day

That locomotive is HUGE holy cowl

I was at EMD LaGrange when this was built. 103 long over the coupler pocket but the erecting bay was on;y 100 feet column to column. They used two 250 cranes and moved it station to station on an angle. Finally straightened out at the truck station and then forward into the air brake shop. Two special 645 E3 engines. 3300 HP each.

I would love to see that thing start on a cold day. 😁

Just watching an old turn-table is a treat...Only saw one once at the FWD yard in Childress TX...

I'll just say I've seen this locomotive on an earlier video on KZfaq I think it produces 12,000 horsepower with a two engines it has in one engine it's the biggest they ever made thank you.

Look at the riveted construction of the turntable: That shows it was built BEFORE the 1950's. It is REALLY OLD !

It's beautiful

Thanks- I needed help falling back sleep. 👍

Cannot beat that EMD sound, esp the 16 cylinder 645!..

They need to put Big Boy 4014 and DD40X 6936 together!

Nice DDA40X

This is really something too see.

I'm sure the little boy seen in the cab of 6936 was getting the ride of his life! What a thrill! Very nice.

Esa si es una gran locomotora 👍

UP's got themselves some real gems, don't they?

That thing is huge. Probably could handle a monster train of 300 cars by itself.