Russian engineering is when you make a racecar for the road but you dont have roads.

Everyone else uses moderate to calming music for their background , this guy uses boss music. It's an interesting experience.

Funny that this locomotive was ever built. They ordered the largest ever Beyer Garrett around the same time, which was never heard of after it was delivered. The Garratts were generally successful.

When considering the 10, 12, and 14 coupled locomotives to modern designs, remember that wheel slip detection technology did not exist. The general idea was to put as much of the engine weight on the drivers as possible, and use pilot and trailing wheels to help the locomotive enter curves, and limit axle weight, although the extra drivers helped there too. A 14 coupled locomotive was simply too long for most existing rail lines in the Soviet Union.

If i'd built a steam loco with 14 driving wheels, it will be a 4-8-6-4

And that’s why Britain and America had a driving wheel limit on steam locomotives.

as a book i have on trains stated, "an articulated design was really needed for more than 10 driving wheels" 12 wheel would be pushing the limits, but 14? thats a no go straight from the start

And maybe one day, we'll see 9000 restored for excursions in 2029 for the golden spike at the completion of the transcontinental railroad in 1869

At 85% cutoff, the locomotive would have had 88,314 pounds of tractive effort. However, I take it that the Soviets would have measured the AA-20's power at 69%, hence the 71,490 pounds of tractive effort. Her tractive effort at 85% cutoff would be somewhere between that of a Southern Pacific 4-10-2, which has 86,590 pounds of tractive effort minus the booster, and a Chesapeake & Ohio T-1, which had 91,584 pounds minus the booster.

Thank good ness you made a new intro for episode 3, just shows how far you’ve gotten better at making these videos

The Russian RR used lots 'O drivers because they used cheap iron rails and widely spaced ties on the TransSiberian Ry. Take for instance the Frisco (etc.) 2-10-0s to do the work of a 2-8-0. The Frisco bought the embargoed Russian engines. The 4-14-4 was probably an attempt at providing a large engine to run on brittle frozen iron rails.

If it didn’t have Cyrillic lettering on the smoke box door, I’d think it was another Union Pacific stunt. 😏

This is amazing

Thank you from Wales UK, that was very interesting. (newly subscribed) 👍

That's insane dude, 😰😰😰 I never seen anything like it and I even said that there's no way there could be an engine with more than 12 drive wheels. I guess I thought wrong

The Prr T1 was not a failure. It was tested on the N&W and C&O and their crews love it !!!

Here, in Indonesia, we have a crazy-looking F10 Locomotive. it was a 2-12-2T tank engine!

The French also use the axle counting system as well.

You did not mention that the 9000s had three cylinders, which certainly contributed to their higher reactive effort compared to the AA20.

One solution used on the UK 9F 2-10-0 was for the central axle wheels to have no flanges.so the wheel was still load bearing in the vertical. For a #-12-# it may require the middle two axles to be flangeless and a $-14-$ the middle 3 axles. The wheel tyre width may need to be wider to stay on track. All dependent on track geometry and condition, design loading , axle rigidity and suspension detail.

Well researched, thanks.

Some Railroad company: let's make a 14 driving wheel engine. (Learns about the AA20) uh never mind.

I don't understand why they didn't turn it into an articulated. They not only made a locomotive with two sets of six drivers, but they also made the 2 P38s, which were yellowstones

What a crazy steam locomotive design.

There is the ATSF 5011 2-10-4s that can produce more tractive effort then the 9000s.

9000 is the only surviving 4-12-2 steam locomotive in the world

Awesome video of roasting the AA-20

I have to add something on the tractive effort subject. You stated that the boiler was undersized, but boiler size has nothing to do with the maximum tractive effort a locomotive can develop. Main parameters are cylinder bore, stroke and wheel diameter, as well as max boiler pressure. The boiler size determines how well a locomotive can maintain tractive effort trough a range of speeds so to say, this is known as power output, the amount of horses a locomotive can develop. Power output on a steam loco can vary quite a bit depending on the quality of coal and how well the fireman/stoker does his job, even on a loco with mechanical stoker. On the AA-20 not the overall size of the boiler would have been the problem, but its design, it didn't have a combustion chamber in front of the grate and boiler tubes that were too long, features which the 9000 class had. But said this, the tractive effort of the AA20 was disappointing. A German Br44 2-10-0 which operates at a similar boiler pressure and has an axle load of 21 tons can develop 340kN (76,400lbf) of tractive effort, but this too is a 3 cylinder engine.

The 9000 is also one of the few 3 cylinder American locomotives that I know of

Atleast we have 9000

In America train moves on track, but in Soviet Russia train moves track

Adolph Giesl-Gieslingen has written a book about 6 and 7- coupled locos. In the chapter of the AA20 stands that this Monster had no

i was thinking about an engine with 20 connected drive wheels thats somewhat bigger than this engine in my head itself...

I love 9000 saying lol on the thumbnail. it's been my favorite locomotive for about a before watching this. 8:39 Also nice know the 9000 class isn't as bad as I thought.

The one difference I have with the video is that I personally WOULD LOVE to build an AA20/4-14-4 in lego. It'd be worthless because lego's track curves are *far* too tight but it'd be a cool looking model :)

Comrad. (HITD joke.) It would habe worked in the states... With a bigger firebox.

even if the locomotive was a complete failure, it should have been preserved as a piece of Railway History.

Do you still think that background music was a good idea?

This. Is. FANTASTIC! Very good comparison of the technical aspects of this locomotive to the 9000s and other American Steam locomotive. The narration and background music also makes this episode great! I made a similar video on this engine a few months ago for my own locomotive documentary series, Remarkable Engines, but it focuses a bit more on the Russian side of the story. (Also sad to hear that rebuilding a PRR S1 wouldn't be practical, but that's besides the point.) Bravo! Just subscribed!

Did I hear him say “worser”? I did…”worser than the 9000’s”. SMH

Good video, background music is too damn loud at the beginning

I have always wondered about this locomotive. Al i ever saw of it was an obscure photo of it I think it was Trains magazine.

Comparing tractive effort of locomotives with vastly different adhesive weights is kind of unfair. AA70 had 20ton axle load, while 9000s were scratching 30tons per axle - if I recall correctly. 320kN at 20 tons per axle gives it factor of adhesion of 4.37, which is bloody good for a steam locomotive. That being said - AA20 was a 'publicity stunt' of the russia stronk variety. USSR never needed such a beast, so, since it was a failure, it was just sidelined and scrapped. You could probably make this beast work, but there really was no reason to do so.

May I ask what’s the boiler diameter, width length and height of the steam locomotive because I think I might build it in lego that could (possibly) run

will you do the PRR Q1 sometime?

Why can’t you just make the music quieter your already editing the photos in order for your video

Probably the most widely built ill-considered locomotives were the Atlantic's, not powerful enough for the new steel passengers cars, poor braking power, and if built with 80' drivers, way too fast for existing track structure, or schedules. But they did fit on existing turntables and in existing roundhouses. And who wanted to build a more logical Pacific and tell the board of directors all those would have to be replaced? 🤓

The aa-20-1 4-14-4 could be a really neat display lego locomotive honestly instead of building a lego running version. Just a thought of mine Also am I the only one who wished the aa20 was preserved

Honestly, it looks really cool. I thing making it articulated would have made it much better.

you know your locomotives bad when locomotives with less boiler presure and firebox area are out hauling it

There was plans for a second AA20 but as you said it was so unsuccessful it never happened

1:41 the music actually suits the picture of Union pacific 9029

I’ve always thought a better wheel arrangement classification for instance for this loco would be 2-H-2, 9000 would be 2-G-2 and Big Boy 2-D-2-2-D-2 etc, much simpler.🇦🇺

👍

could you do fowlers ghost for the next DOA episode

Wait have you built Pere marquett 1225 out of Lego

The AAHAPEEB sign on the AA-20 makes my brother laugh when he says it

Ill make a 4-10-10-4 wheeled Articulated Steam locomotive but I wish to know what itll look like and how itll function and tests

4:09 This Locomotive Looks Like 4-8-6-4

8:27 PRR built this one for passenger train service as an answer to NYC streamlined Hudsons.

If you can make the background music a little bit loader that would be great, I almost couldn’t here it playing.

Приятно видеть как англоязычный канал разбирает советские паровозы.

Im a bit confused ik the big boy is a 4 8 8 4 but that means in total of driving wheels they have 16 yet they work great but the AA20 dosent work

good lord do we need the Darth Vader death Star music and so loud! Its only railways!

There is a 4-10-10-4 & 2-5-5-2 steam locomotive in USA at 1800s

Build the museum where the giant train is displayed and build it out of Legos and put it on display

Up 9000 : you been troll you been troll yes proboly been told

I will built a replica of the s1, butt this time, it will be fitted with a articulated frame, and ad more whait on the driving wheels, and less wheels

Didn't Russia make something similar to Challenger or Big Boy, but only 3-4 were ever built? At least it had flexibility. Also European track are slightly more narrow and won't handle the weight of American locomotives?

Bro. I love your stuff but would you just strait up like some help with editing your videos audio. It's all over the place

I missed the „IGOR“ xD

Like defenitivelly

I feel you are being too harsh I mean its not the locomotives fault the designers had the worst idea ever

I bet the designers of this locomotive were executed after this considering that this is Stalinist-era USSR.

The Soviet Big Boy.

So the AA-20 holds the world record for the second largest rigid frame locomotive in the world

Look Russia points for effort but maybe leave the big locomotives to the US

aa20-1 's footage I can find: kzfaq.info/get/bejne/bNJma6qZvcnMiqs.html didn't thank me instead a youtuber called : @UCTXPL5uOGhq64P7AOeFamDw but in russian.

Holy shit i can't even hear you man good video but the music is way louder than your speaking

0-14-0 Locomotive Exist?

You mentioned nobody ever building a full-scale replica of the PRR S-1, but they are doing the next worst thing: building a full-scale replica of the PRR T-1.

USSR should See the Bigboys and Watch Sad Story of Henery and We Are showing Troll faces to USSR

And I like the AA-20 Locomotive that I am making AA-20 Locomotive with lego blocks ok ha ha ha ha lol

4:20 Other European countries uses this classification system too. A fine work of Andre Chapelon , the A2 is referred to as 2-4-2 which actually 4-8-4 (and it is a REAL Northern since it was made as tender locomotive) in Whyte notation.

Da, comrade, bigger is better...well, maybe nyet.

Why music to drown out your breathing? Does your breathing sound like a steam locomotive?

I would have liked to watch the whole movie but the music was to loud and bad.

here's an idea....if you can't control the background music then get rid of it so we can hear you.😀

Why is the music so loud I can barely hear you

Also if l bulid 6-4-2 locomotive

BUILT THE AA20 WITH LEGO

Make a lego 9000

Dadgum rooskies

Music is too loud to understand you. Then the volume is too low.

yep, they shoulda copied the 9000

would have been nice to not have to hear all that damn terminator etc music in the background

why not build it out of cloth

For Modern day European standard Railvehicle axle formula it would be a 2' G 2' + 3' 3'

WE HATE THE AA20-1

Remove the one about the E2 since it is Thomas the tank engine!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!