. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . pliances a Vol. XXII. IN Liberty Street, New York, October, 1909. No. 10 Tractive Effort and Horse Power. Our frontispiece this month is froman excellent photograph of a moving traintaken by Mr. E. L. Greene, of SouthParis, Me. It is a 4-4-0 engine on theGrand Trunk Railway pulling a four-cartrain, but it serves to illustrate a few re-marks on tractive effort and hnrse power. seem, when the engine is just starting un-der full steam with late cut-off, it is notdeveloping as much horse power as
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . pliances a Vol. XXII. IN Liberty Street, New York, October, 1909. No. 10 Tractive Effort and Horse Power. Our frontispiece this month is froman excellent photograph of a moving traintaken by Mr. E. L. Greene, of SouthParis, Me. It is a 4-4-0 engine on theGrand Trunk Railway pulling a four-cartrain, but it serves to illustrate a few re-marks on tractive effort and hnrse power. seem, when the engine is just starting un-der full steam with late cut-off, it is notdeveloping as much horse power as it willdevelop when running on the road asshown in our frontispiece. The maximum starting power or tractiveeffort may conveniently be considered asequivalent to the weight the locoinotive have an ordinary 4-4-0 type of enginewith cylinders 17 x 24 ins., 180 lbs. steampressure and s6-in. driving wheels. Suchan engine would have a calculated trac-tive effort of 18,950 lbs. That is theweight we may suppose to be hanging atthe end of the rope over the cliff, andthe engine can just sustain this weight. STANDARD 4-4-0 ON THE GRAND TRUNK WITH LIGHT PASSENGER TRAIN. The expressions tractive effort, startingpower and draw-bar pull are used moreor less interchangeably to indicate thepower developed by a locomotive stand-ing on the rails just at the moment ofstarting, with reverse lever in full gearand the throttle valve fully open. If thereis no slip, the engine then exerts its ;mum tractive effort. Strange as it may can sustain, if a rope were attached tothe coupler at the back of the tender, car-ried over a frictionless pulley and lethang down a well or over a cliff, withthe weight at the end. Theoretically anyincrease of this weight would cause theengine to be drawn backward, if its owninternal friction was eliminated. Suppose, for sake of example, that we against the attraction of gravity. This is,of course, on the assumption that normaladhesion exists between wheels and rails
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