Railway and Locomotive Engineering . trates the relative coal consumption perhorsepower hour of a plain saturated lo-comotive and the same engine equippedwith available power increasing factors. These curves are based on the locomo-tive consuming the same weight of fuelper hour under all conditions of equip-ment and illustrates the fact that the great- June, 1921 RAILWAY AND LOCOMOTIVE ENGINEERING 159 est conservation of fuel can only be ob-tained when advantage is taken of capacityincreasing factors which derive theirpower from a more efficient utilization- ofthe heat units jn the fuel. These
Railway and Locomotive Engineering . trates the relative coal consumption perhorsepower hour of a plain saturated lo-comotive and the same engine equippedwith available power increasing factors. These curves are based on the locomo-tive consuming the same weight of fuelper hour under all conditions of equip-ment and illustrates the fact that the great- June, 1921 RAILWAY AND LOCOMOTIVE ENGINEERING 159 est conservation of fuel can only be ob-tained when advantage is taken of capacityincreasing factors which derive theirpower from a more efficient utilization- ofthe heat units jn the fuel. These curvesrepresent the same engine the UnitedStates Railwav Administration Hght 2-8-2 versed when 45 miles per hour is other words, at all speeds where theengines are likely to damage the track theheavy Mikados with Ught parts are saferengines than the light Mikados with heavyparts. In this comparison, it should beborne in mind that the heavy Mikado has. type which formed the basis of the othercurves. The paper also touched upon the advan-tages to be derived from the use of highquality steel for the reciprocating partsand showed that if applied to the recipro-cating parts of a U. S. Railway .Adminis-tration Mikado locomotive, it was pos-sessed of interesting possibilities. Hetook a light and heavy AdministrationMikado, both of which were actually builtwith reciprocating parts of open hearthsteel. The results in rail pressures whichwould be obtained if the heavy .\dminis- 1(1 per cent more tractive power than thelight one and 14 per cent more heating: urface. The total weight of the heavy-Mikado is per cent greater than thelight one and has from 10 per cent to 15per cent greater capacity. It should as to which should be chosenfor efficient service. Liquid Coal The news comes from Germany thatthe chemists of the country have at lastsolved the problem of liquifying coal andthat a commercial application of the proc- The
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