Worlds largest diesel locomotive on the Cheyenne turntable DD40X 6936.

For a in depth look at this type of locomotive, both inside and out see my other video here https://www.youtube.com/watch?v=ERNezIjd-GE

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!

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

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

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.

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

Imagine being the engineer operating this absolute monster of a machine

My father road this rail for 33 years RIP Pop.

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

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♥️♥️♥️

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

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

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.

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.

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.

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

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