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To: Jacques Chitte who wrote (51746)	6/3/2000 9:57:00 PM
From: Gauguin	Read Replies (2) \| Respond to of 71178

Conrods, for connecting rod. That was the part we worked on, on the Bicentennial train. That's a very clever formula thought there, Lather. I looked at the tractive ratio formula too. Unfortunately, (and I mean that most sincerely), I gotta go. An encyclopedia with the early patents probably has our summation. It was not Franklin, who mayhaps only proposed it; it was someone else I have in my marks. I'll see if I can find it real qwik. If you scan down this list of patents, you will see rail wheel at least once. ipmall.fplc.edu AND, at this address, a man who made a fortune on rail wheels: whitneygen.org "In 1848 be invented a process for annealing car wheels, that increased both their speed and capacity. This invention gained him a fortune and about 75,000 car wheels were annually manufactured by A. Whitney & Sons."

To: Jacques Chitte who wrote (51746)	6/3/2000 10:43:00 PM
From: JF Quinnelly	Read Replies (1) \| Respond to of 71178

"Tractive effort was a theoretical quantity. Railroads preferred it to HP ratings because HP involved a time quantity which was determined, in part, by how well the locomotive was being fired (among many other variables). Tractive effort, on the other hand, was determined strictly by the geometry of the locomotive. Tractive effort can be determined by the following equation: TE = [c P (d)^2 s]/D TE = tractive effort in lbs c = a constant determined by the mean effective pressure and friction (usually 85%) P = boiler pressure d = piston diameter s = piston stroke D = driver diameter Using the above equation with specifications for a Big Boy yields: Boiler pressure: 300 lbs Cylinders: 2x 23.75x32 inches Drivers: 68 inch TE = [.85 300 2(23.75)^2 32]/68 = 135,375 lbs" steamlocomotive.com Woof.