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.
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.
The "T" normally would mean that when it's with the Whyte wheel arrangement listing like 0-6-0T or 2-8-2T, but here it's added to 614's number to signify that the locomotive is being used for testing in the Ace 3000 project, which was intended to possibly create a fuel efficient modern steam locomotive, at a time when oil prices were high. Poor test results and falling oil prices led to the project being cancelled, but it wasn't a total loss as 614 spent a month being tested with these revenue coal trains, which was a delight to railfans at the time, especially as 614 is running on home rails, being the C&O New River route. I'm not sure if she ran this line in her C&O days, but regardless, she makes a fine sight on it.
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.
"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....
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 RU-vid 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.
These videos have been very helpful. I'd love to see more information on the frame, suspension, pilot and trailing trucks of these more modern steam locomotives (which I know isn't the most interesting or exciting topic 😄). I'm really want to understand more about what the cradle does, and how the rear weight of the cab and firebox is distributed to the trailing truck (it has something to do with "heart rockers" I believe). I recently bought a copy of the 1925 Locomotive Cyclopedia, which has tons of knowledge, but it's still hard making sense from the technical drawings. I'm debating on purchasing UP 844 1.5" scale model drawings to study and understand more about every nut and bolt of these machines. The 7.25" gauge model is so large, the designer even included prototypical frames and suspension. Studying live steam locomotive drawings has been helpful as their designs tend to be simpler.
I've been looking forward to this tutorial for some time now. Both this and the previous video have given me a better understanding of steam locomotives. Thank you so much!
Well here it is known as Heusinger gear. Got the name Walschaerts during WWI to hide the German origin. Walschaerts was 2 years after Heusinger " inventing" this gear.
Wonderful explanation. It could explain the force of the steam when it enters the piston and how a small piston like that of locomotives can support so much weight.
