. Railway age gazette . nce of 13 miles, the conditions are still more difficult. Thefirst 654 miles contains 454 miles of up-grade, varying from 75to 80 ft. to the mile, and the last 6/, miles is a continuous gradeof 80 ft. to the mile. The scheduled speed for the first men- the center of the lowest tube to the top of the grate is 25/;; in..According to the American Locomotive Companys standardsystem of boiler proportioning, a cylinder 27 in. in diameterusing superheated steam having a pressure of 185 lb. will de-velop 2,427 cylinder horsepower. One cylinder horsepower re-quires an evaporatio
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. Railway age gazette . nce of 13 miles, the conditions are still more difficult. Thefirst 654 miles contains 454 miles of up-grade, varying from 75to 80 ft. to the mile, and the last 6/, miles is a continuous gradeof 80 ft. to the mile. The scheduled speed for the first men- the center of the lowest tube to the top of the grate is 25/;; in..According to the American Locomotive Companys standardsystem of boiler proportioning, a cylinder 27 in. in diameterusing superheated steam having a pressure of 185 lb. will de-velop 2, 427 cylinder horsepower. One cylinder horsepower re-quires an evaporation of 20.8 lb. of steam per hour. To de-velop full cylinder horsepower a total evaporation of 2, 427 x20.8, or 50, 500 lb. of steam per hour is required. Boiler tubes25^. in. in diameter, 20 ft. 6 in. long and spaced H in. give anevaporation of 8.69 lb. of steam per square foot of heating sur-face per liour. Boiler flues 554 in. in diameter, 20 ft. 6 in. long, . 614 December, 1914 RAILWAY AGE GAZETTE, MECHANICAL EDITION 61:.