. Revised and enlarged ed. of the science of railways . r. It must also beremembered that tractiveresistance is dependent uponspeed. In practice the weight placed on theaxles of the driver, and so on the wheel and rail,must be proportionate to the strength of the rail;this limitation, therefore, influences and deter- Rear View of parts shown above, notincluded in the side view ofthe locomotive preceding this,are as follows: 06 Tlirottle lev-er. 67 Gauge or water Water gauge, 69 Fire door,80 Frame tie. b2 Oil-can .^ Plugs at arch support Damper. * The ge
. Revised and enlarged ed. of the science of railways . r. It must also beremembered that tractiveresistance is dependent uponspeed. In practice the weight placed on theaxles of the driver, and so on the wheel and rail,must be proportionate to the strength of the rail;this limitation, therefore, influences and deter- Rear View of parts shown above, notincluded in the side view ofthe locomotive preceding this,are as follows: 06 Tlirottle lev-er. 67 Gauge or water Water gauge, 69 Fire door,80 Frame tie. b2 Oil-can .^ Plugs at arch support Damper. * The general practice of builders in America is based on thetheory that for passenger engines the weight on the drivers isequal to four to one pound of tractive power; freight enginesfour and one-fourth to one, and for switch engines four and one-half to one; or, in other words, in the last case, four and one-halfpounds of weight to every pound of tractive power. The Master Mechanics Association of America endorses this formula. DESCRIPTION OF LOCOMOTIVE. 65. mines the power of the machine. Speed is furthera factor in this, that it increases the destructiveforce on the rails. Locomotives may bedivided into four classes,each especially adapted tothe service it is designed toperform; namely, those usedfor switching cars at stationsor yards, freight traffic, ordi-nary passenger traffic, subur-ban traffic. Switching en-gines usually have four orsix driving wheels, uponwhich, in most instances, thewhole weight of the loco-motive rests. The driversare made to bear the entireweight in order to afford theadhesion necessary for start-ing heavy trains quicklyand at frequent engines also haveshort wheel bases to enal)lethem to go around sharpcurves and over switchesbranching from the maintrack at sharp angles. Thewheels are placed near together, usually betweenthe smoke box and fire box. The short wheelbase of the switching engine renders it unfitfor general traffic, because of t
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