Posted by Dean on July 29, 2018 at 15:31:17 from (68.50.160.151):
Folks, I invite those of you who are not railroad buffs or interested in things mechanical to skip this video as it is long and of interest to a limited audience.
Those who chose to at least give it a try may want to fast forward to around 5:00 if you are not interested in steam locomotive stack talk.
For those of you who do not know, a reciprocating steam engine makes maximum torque at stall. This, of course, is torque rise taken to the extreme.
I will also ad that steam locomotives have two double acting cylinders, one on either side. In effect, a four cylinder engine. At low speed, you can count the barks of the exhaust while watching the revolutions of the drivers. Four barks per revolution.
Here, we find NKP Berkshire 2-8-4, 765 pulling a heavy train up a significant hill unassisted. 765 has more than adequate power and steam but she is being worked at the limit of adhesion and her engineer is limiting power to prevent wheel slip. Note the pressure relief valve popping off at about 6:35. Again, plenty of steam pressure and power, but can 765 crest the hill without slipping?
The train continues to slow but the torque continues to rise. Try this with a DE unit.
You will need to watch the entire video (or FF) to see is she stalls.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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