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Blondiehacks brought me here. Wow, I'm impressed. I did build small model IC and Stirling engines, maintained a small stationary steam engine, and do theoretically understand the Stephenson valve gear. Stephenson was a genius, but Walschaert definitevly exeeds that level. Thanks a lot, learned very much, exceptional tutorial and animations! Need to have a closer look onto the valve gear next time I'll came across a steam locomotive...

I came here trying to learn how this all times out for some models I got, and now im just fascinated a bunch of guy in the 1800's could figure this out and then perfect it.

What a wonderful explanation! The modeling is superb, and the build-up of the different parts of the system makes this very complex setup understandable. Bravo!

His audible breathing between words throws me off and distracts...

Need the audio be so harsh sounding?

Wow! An amazing exposition on how to create a mechanical computer to for complex, adjustable relative motion. Starting from the first eccentric through successive refinements to tweak the model is beautifully explained, thank you.

I am designing the steam locomotive. What about suspension for drive wheels and crank center distances.. can you please explain

Spectacular job! Who did your animations?

I hope 614 will travel through the new river gorge again when she returns to steam.

Easy to understand, thank you.

Good

Good, very good!!!

Any intention to finish this series? The last two videos are so good, if love to see a breakdown of baker and Stephenson valve gear as well.

Are there plans to finish the series? I would love to see a breakdown of baker and Stephenson valve gear! 😊

Yessss!!!! I Can't wait to see this one running again.

whos here watching this knowing its getting restored

How have I not seen this video before??? As a recently retired video guy with nearly 50 years of experience (and a few Emmys) this is some great footage shot from a moving vehicle! Nice work and a great subject! 👍 I'm assuming by the look of the video that its a Sony 1820?

Great explanation of the valve gear is there one for Stevenson value gear

Wow, I have been looking and looking for this kind of design analysis and interpretation. This is absolutely fantastic and very clear. Thank you very very much for this animation with detailed explanation. :)

This is absolutely the best explanation of valve operation of all videos I have viewed. Thank you for this.

The biggest single take away from these tests was the people who were behind the AC3000 project simply didn't understand how railroads were using their then new, second generation diesel-electrics. Chessie would load up the diesel-electric consist on these coal trains to the absolute maximum tonnage they could move at the speed they wanted to move the train at. So, the locomotives, the diesel engine, the turbocharger, the traction alternator, the traction motors were working at full tilt all the time. Which made the locomotives incredibly efficient on a ton-mile basis. This is EXACTLY what you can't do on a steam locomotive to have any economy. Steam locomotives operate as efficiently as they can within a rather small speed and tonnage rating window. That is why back in the steam era you had so many different steam designs used in specific operations. As soon as the ACE3000 people realized this, they knew it was a lost cause.

The only people who "underrate" the 614 are unknowledgeable railfans. They are a odd bunch who seem to work on emotions rather than facts from science, engineering and history. The C&O J3a was always regarded in the industry in the top of the 4-8-4 class and one on the finest engineered steam locomotives in history. The 614's performance over the years has verified that. Anything other than that is just silly railfan noise.

Awwww 0:01

19:42

I'm looking forward to the next video in the series

I like how you showed an intuitive way to come up with the walschaerts valve gear, maybe even close to the inventor's thought process? The video then proceeds to deeply examine how each component it the mechanism we came up with moves, and what that movement entails for the operation of our engine.

Very useful thanks!

At 27:22, this set up is used in garratts we're the rear engine is travelling backwards

6:16 listen to that C&O 6 chime sing

this explanation is very clear many thanks

I think he forgot the oil valve

Took me a long time to be in the mood to watch this, but that gave me the opportunity to watch this _and actually learn something._ This is a very well put together presentation with clear explanations of everything, very easy to follow visuals, and a great narrator. Looks like I'll be giving the steam engines in train simulator another try.

Whistle at 6:18

Thank you so much! Eventualy I began to understand the details!

THE GREENBRIER AND I CALL IT BIG BEER!!!

Fantastic video. Can’t wait for the Baker video. Also hoping a Stephenson’s valve gear video isn’t out of the question?

Why 614T? The T would mean tank engine

Any videos on rc poppet vaulve gear

Very good video with excellent graphics covering all aspects of this valve motion.

Outstanding in every way! Question: Because of the area of the connecting rod, the main piston must have more pushing power in one direction. Does this matter at all?

I watched both episodes a lot earlier, but never commented on them untill now. These are superb videos when it comes to explaining locomotive valve gear and valves! I am very invested in this subject as of late and can't wait for more installments! Can we expect more valve gears like of the dual eccentric type (Allan & Gooch) or should we look forward to similar valve gears to Walschaerts-Heusinger and Baker? Will poppet/cam valve gears also be discussed? i.e. Caprotti, Franklin, etc.

Are we possibly going to see other types of valve gearin in the future? This one is excellent

No sound in video!?

Very well done 👍 did you do the animation too?

9:44 the valve gear reminds me of arthur’s one

"MOIN" as we say here in north germany... or as jock spoken south scandinavia. on the one side so interesting to me, how small our hobby world seams to be, that someone like you have entered my chanal. thank you for that. on the other side a lot of respect to your video of explaining professionally steam locomotion technology, says the german vehicle engineer and welding engineer. TO OUR HOBBY, all the best and more please....

Ummmm....I Love this video Thank you, that is all

Some more advance related subjects that would be nice to cover. For compound locomotives (e.g. mallets) is there anything to prevent the condition where the high pressure cylinder is in exhaust stage, while the low pressure cylinder has its intake blocked, or is some kind of buffer/surge chamber used to handle this ??? In the case of of locomotives with 3 steam cylinders, how is the center cylinder power and control linkages connected to the locomotive drive chain ??? Some locomotives had provisions for a 'booster', a low speed steam motor that can be located on the locomotive trailing wheels, or on one of the tender wheels to provide an addition 'boost' to start a heavy train moving from a full stop. I have not seen anything on RUclips on how these 'boosters' operate. Can something be produced to cover this ???

This is a brilliant video. Even if you "know" how the valve gear operates, this addresses the sort of things you don't think about but were crucial when Walschaerts, or Heusinger (which is how we know it here) invented the beautifully simple and effective motion. - Just want to say, there was a lot of locomotives with outside Stephenson's and especially Allan's valve gear in Austria - Hungary. I'm from Czechia and when you said it, I was like, no, this is normal and does fit quite well? :D

This is a magnificent explanation that is easily the most comprehensive and clear description of an otherwise mind boggling mechanism. I have been in awe of the Walschaerts Valve Gear (like many) with its almost hypnotic motion on a running loco; it speaks volumes of the brilliance of its inventor. I've often wondered how long it took to work out the entire design from inception, and the progression of development must have been an enlightening experience. Many thanks for the hours of work in developing this fantastic tutorial.