. Railway mechanical engineer . Heavy Freight Lo otive for the Union Pacific Which Develops 2,950 Horsepower locomotives haul on the line east of Evanston, where for 400miles the maximum grade is .81 per cent. The 2-10-2 type locomotives have a rated tractive effortof 70,450 lb. with 285,500 lb. on the driving-wheels, the ratioof adhesion being The total equivalent heating sur-face is 7,045 square feet or 1 square foot for each 10 tractive effort. This ratio indicates ample steaming capac- with Security sectional arches and the coal burners are firedby Street type C stokers. The su
. Railway mechanical engineer . Heavy Freight Lo otive for the Union Pacific Which Develops 2,950 Horsepower locomotives haul on the line east of Evanston, where for 400miles the maximum grade is .81 per cent. The 2-10-2 type locomotives have a rated tractive effortof 70,450 lb. with 285,500 lb. on the driving-wheels, the ratioof adhesion being The total equivalent heating sur-face is 7,045 square feet or 1 square foot for each 10 tractive effort. This ratio indicates ample steaming capac- with Security sectional arches and the coal burners are firedby Street type C stokers. The superheater consists of 45elements and has a superheating surface of 1,262 square piston valves are 15 in. in diameter and arc drivenby Walschaert valve gear which is controlled by a Ragonnetpower reverse gear having both air and steam piston heads, a drawing of which is shown below, are 321 322 MECHAXICAI. VuL. 92. Ko. 6. U.\E, 1918 RAILWAY MECHANICAL ENGINEER 323 steel castings of dished section, seven inches wide, withphosphor bronze bearing rings and gun iron packing phosphor bronze rim is cast on the piston before thegrooves for the packing rings are turned. Inspection of thesepistons after six months service showed that they had wornless than lu in. The piston rods are of open-hearth steel, heat- bilt type, with equalized trucks and one piece cast steelframe. RESULTS OF RO.^D TESTS The Union Pacific has conducted road tests of locomotivesof many different types and classes. From the results of Piston SDeed ft. per :nin 0 to 250 Ratio ci M. E. P. to (saturated) .85 Boiler pressure (superheated) .85 .542 1, 1, 1, 1,300 1,400 1, .155 .125 .220 .190 .160 treated and hollow-bored. The same material is used forthe crank pins and driving and trailing which arealso hollow-bored. The
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
