. American engineer . at Northern engines rank sixth in regard to total weight andare a very close second to the record holders on the Virginianin respect to power. They are litled with Emerson high degreesuperheaters which have 1,368 sq. ft. of surface measured on theinside of the tubes. This slightly exceeds the area of the super-heaters on the Virginian engines, which are of the Schmidt evaporative heating surface, the Great Northern engine issomewhat less both in the firebox and in the tubes than theVirginian, and the boiler is 10 in. less in diameter, both at thefront ring and at
. American engineer . at Northern engines rank sixth in regard to total weight andare a very close second to the record holders on the Virginianin respect to power. They are litled with Emerson high degreesuperheaters which have 1,368 sq. ft. of surface measured on theinside of the tubes. This slightly exceeds the area of the super-heaters on the Virginian engines, which are of the Schmidt evaporative heating surface, the Great Northern engine issomewhat less both in the firebox and in the tubes than theVirginian, and the boiler is 10 in. less in diameter, both at thefront ring and at the largest point. There is also considerabledifference in the grate areas, which are sq. ft. on the Vir-ginian and sq. ft. on the Great Northern. Eight of thetwenty-five engines, however, are arranged for oil burning. Itwill be noted that no feed water heater is provided in the frontpart of this boiler, as was the case in the previous order. Thetubes have been increased to 24 ft. in length and the remainder. Mallet Locomotive Having a 100,000-Pound Tractive Effort When Working Compound; Great Northern. were built in 1910. These have 23 in. and 35 in. x 32 in. cylin-ders, 55 in. drivers and a tractive effort of 82,000 lbs. They arefitted with Emerson superheaters, giving 480 sq. ft. of heatingsurface, and have feed water heaters incorporated in the frontsections of the boilers. They have a total weight of 378,300lbs., of which lbs. is on In 1910 this companyalso converted some. consolidation locomotives to Mallets bythe addition of a new front unit which gave a locomotive of the2-6-8-0 type. There is a feed water heater in the new frontsection, and a superheater was applied in the old boiler.§ The locomotives just received are considerably larger thanany of the previous classes. They have a total weight of , of which 420,000 lbs. is on drivers. The cylinders are 28in. and 42 in. x 32 in. The steam pressure has been raised to210 lbs. while
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
