Train Fans?

 
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wsherrick
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Post by wsherrick » Tue. Dec. 01, 2015 2:36 am

windyhill4.2 wrote:It appears as tho it weighs more than it can pull, OR, am I reading that wrong ?
The Tractive Effort is the adhesion it has to the rail. That is a factor of weight and the height of the driving wheels. Freight engines had smaller drivers which applied more grip to the rail than passenger engines.
This engine is a dual purpose engine so the drivers are of a moderate height.
By the way this locomotive can pull 40 or more times it's own weight and do it at a fast speed as steam locomotives continually develop more horse power the faster they until they reach boiler capacity or they tear themselves apart, whichever comes first.

 
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Post by jpete » Tue. Dec. 01, 2015 8:42 am

Thanks for the explanation.

Now how about the pounds of steam? I'm pretty sure that isn't PSI but maybe it is.

I have seen an old high pressure steam boiler that had circular graphs showing pounds of steam per day and I think I was told it had something to do with actual "weight" of steam but I'm unclear on how or why.

 
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Post by Lightning » Tue. Dec. 01, 2015 9:16 am

I would think it's PSI since pressure is what drives it. When those explode shrapnel will pass right thru you at 100 yards.

Even when the steam tractors blow up, anyone nearby is usually killed or worse. They run at 150 PSI


 
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windyhill4.2
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Post by windyhill4.2 » Tue. Dec. 01, 2015 10:08 am

wsherrick wrote:
windyhill4.2 wrote:It appears as tho it weighs more than it can pull, OR, am I reading that wrong ?
The Tractive Effort is the adhesion it has to the rail. That is a factor of weight and the height of the driving wheels. Freight engines had smaller drivers which applied more grip to the rail than passenger engines.
This engine is a dual purpose engine so the drivers are of a moderate height.
By the way this locomotive can pull 40 or more times it's own weight and do it at a fast speed as steam locomotives continually develop more horse power the faster they until they reach boiler capacity or they tear themselves apart, whichever comes first.
William, Thanks much for that explanation :D

 
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Post by top top » Tue. Dec. 01, 2015 11:27 am

Pardon me, Is that the Chattanooga Choo Choo?

As best I remember the older D9 crawler operating weight was just under 100,000 lbs and could exert 70,000 lbs on the drawbar. Would that be the same as tractive force?

The sign says steam pressure 250 lbs, but does not specify per square inch or square centimeter, etc. It does say steam pressure, not volume, so can we assume it is PSI? My friend is a boiler operator at a college, I think he said his Fireman's License allowed him to operate equipment that generates above 70,000 pounds steam per hour. I don't remember how much steam they typically produce in cold weather but it sounded like a big number. But then he heats a bunch of large buildings spread out all over town, plus all the hot water for the dorms and cafeteria. He runs four boilers plus a chill plant. Next time I see him I will ask about steam pressure and steam weight, maybe he can enlighten me a little.

 
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Post by Lightning » Tue. Dec. 01, 2015 2:25 pm

Imagine 250 PSI pushing on a 1 foot diameter piston.
250 PSI x 113 sq in = 28,250 pounds of force :shock:
That's some moving power there... :lol:


 
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Post by northernmainecoal » Tue. Dec. 01, 2015 2:43 pm


 
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Post by SMITTY » Tue. Dec. 01, 2015 8:54 pm

Ahhh yeah, never thought about the steel-on-steel traction issue there. Thanks for the explanation fellas!

 
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Post by coaledsweat » Mon. Dec. 07, 2015 2:10 pm

CP's Christmas train

https://youtu.be/a_jWaScptQ4

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