. Steam engines, a thorough and practical presentation of modern steam engine practice . ion type is used for heavy freight service. It has eightcoupled drivers and a pony truck in front. There are also a greatmany special types for special purposes. In switch yards a type ofengine is used which has four or six drivers with no truck. TheForney tjpe has four coupled driving wheels under the engine anda four-wheel truck carrying the water tank and fuel. This type isused on elevated roads largely. Decapod engines are a type usedfor heavy freight service, having ten coupled driving wheels and atwo
. Steam engines, a thorough and practical presentation of modern steam engine practice . ion type is used for heavy freight service. It has eightcoupled drivers and a pony truck in front. There are also a greatmany special types for special purposes. In switch yards a type ofengine is used which has four or six drivers with no truck. TheForney tjpe has four coupled driving wheels under the engine anda four-wheel truck carrying the water tank and fuel. This type isused on elevated roads largely. Decapod engines are a type usedfor heavy freight service, having ten coupled driving wheels and atwo-wheel truck in front. A tank engine is^ one which carries thefeed water in tanks on the engine itself instead of in the tender,as in other engines. A locomotive of modern design that is being largely used forfast freight service and for heavy passenger service is illustrated inFig. 48. It is commonly known as the Atlantic type locomotive,having four leading truck wheels, four coupled drivers, and a two-wheel trailing truck. The leading truck wheels serve in a guidmg 66 STEAM ENGINES. STEAM ENGINES 67 capacity. This engine is a compound type with piston valves, iswell designed, is neatly proportioned, and admirably fulfills everyrequirement. Compound Type. In connection with the subject of compound-ing just mentioned it may be said that in recent years the compoundlocomotive has been found in increased numbers on American rail-roads. A type of compound that has given especial good service andwhich is being adopted by many roads for heavy hill chmbing dutyis the Mallett Articulated Compound. The adoption of the com-pound locomotive has been due to a general opinion among railroadofficials that the findings of a committee of the American MasterMechanics Association were true, as demonstrated by practice. ThisCommittee says of compounding: (a) It has achieved a saving in the fuel, burned, averaging 18 per cent atreasonable boiler pressures. (b) It has lessened the amount of water
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsteamen, bookyear1920
