. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . d, ■ ntilati ■and br iked a well. All ol these are impi irtanl siderations, as i hi . .i constant on the I«i imotive boilei [hi teat n umpl diaries is so great thai I motivi d signers 11.■ v i been fori ed to con :ider itm sell i i ing pi iw er for limited ti happi n thai the drain on the boili r fn -in .in- n is vi ati i m winter;the tune when the train resistance and radiatii m fn m the bi iler ami mnts tothe must. In winter the horsepowercimsumi d bj au ciliaries is ab
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . d, ■ ntilati ■and br iked a well. All ol these are impi irtanl siderations, as i hi . .i constant on the I«i imotive boilei [hi teat n umpl diaries is so great thai I motivi d signers 11.■ v i been fori ed to con :ider itm sell i i ing pi iw er for limited ti happi n thai the drain on the boili r fn -in .in- n is vi ati i m winter;the tune when the train resistance and radiatii m fn m the bi iler ami mnts tothe must. In winter the horsepowercimsumi d bj au ciliaries is abiml 300 ia ten ear train, which may be divided asfollows: 75 h, p. foi operating the two9 in air pumps; 60 for operatingturbo-generators for train lighting, andISO for heating and ventilatingThe total of 300 calls for the com-bustion nl about 1,500 lbs ..I coal perhour. It is common for Pacific typepower in this service to consume 8,000lb of coal per hour. Hence we may-sax thai about 18 per cent, of the coalconsumed is used by auxiliaries I I Atlantic type engine had its lim-. ENGINE WITH I NO SMOKESTAI KS. itations of weight and power. Theboiler capacity could not be increasedwithout increasing the weight per axleabove the allowable limit. Hence itwas necessary to adopt the Pacific typeof locomotive. Even this type of en-gim de\ eloped to the full extent. and in the future, if service require-ments become mure severe, a new typewill have to be perfected—probablysome design of Mallet compound. Thelimitation of the Pacific engine is some-where in the neighborhood of ,with a rail weight of lbs. peraxle. Assuming that the most satisfac-tory factor of adhesion is 5, we have36,000 lbs. as the maximum tractivepower available with this type of en-gine. Increased tractive power neces-sitates increased tractive weight, andthe latter can only be obtained by theaddition of another driving axle, whichmeans a longer rigid wheel base. A long rigid whe
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