. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . were built by the Ameri-can Locomotive Company at their shopssituated in the good, old historic city ofRichmond, Va. desired reserve capacity, even with ex-tra cars on the train. The full tractive power of a locomotiveis only used in starting and in accelerat-ing. The larger proportion of its workis performed while cutting off early inthe stroke. Large boiler capacity is re-quired to maintain steam pressure undersuch conditions as are met with in haul-ing heavy trains at relatively high speed
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . were built by the Ameri-can Locomotive Company at their shopssituated in the good, old historic city ofRichmond, Va. desired reserve capacity, even with ex-tra cars on the train. The full tractive power of a locomotiveis only used in starting and in accelerat-ing. The larger proportion of its workis performed while cutting off early inthe stroke. Large boiler capacity is re-quired to maintain steam pressure undersuch conditions as are met with in haul-ing heavy trains at relatively high , with less weight on driving wheels,better work has been done with thistype than with the ten-wheel engine. This Norfolk & Western machine is asimple engine with 20x28 in. cylinders,with direct motion piston valves, 68 wheels and a calculated tractiveeffort of about 28,000 lbs. The enginecarries a boiler pressure of 200 lbs. Thedriving wheels are all equally spaced,being 72 ins. apart, and all of them areflanged. The driving springs are over-hung, with jointed hangers and the. SINGLE EXlANSION 4-!W. H. I,ewis, Superiuteiident of Motive Power. FOR THE *: WESTERN. American Locomolive Works, Builders. We have the gear factor as before, 30divided by 10, and now the gear effi-ciency fraction, ^, as well. If there is20 per cent, of the power used up insimply turning the toothed wheels, theywill give out, as useful work 80 percent, of the power put into them andthe train of toothed wheels is said tohave a gear efficiency of .8 or ft. Theformula now is 25,000 24 30 8 = — X-X-X-. I 10 10 or 30,000 lbs. The fraction representing the toothedwheels, when used in the formula, willgive the same result if the radius of thepinion and that of the gear wheel betaken, or if the number of teeth in eachare taken, but in any case the gear effi-ciency is one of the factors. It must beremembered that the value of the pin-ion will be in the denominator of thefraction,
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
