Identifier: railwaymechanica92newy (find matches)
Title: Railway mechanical engineer
Year: 1916 (1910s)
Authors:
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York, N.Y. : Simmons-Boardman Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
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 4.05. The total equivalent heating sur-face is 7,045 square feet or 1 square foot for each 10 lb.of 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 ft.The 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 connection.The piston heads, a drawing of which is shown below, are 321 322 KAU.WAV MECHAXICAI. F.XdINKKK VuL. 92. Ko. 6
Text Appearing After Image:
U.\E, 1918 RAILWAY MECHANICAL ENGINEER 323 steel castings of dished section, seven inches wide, withphosphor bronze bearing rings and gun iron packing rings.The 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) .85 300.785.785 400.700.700 500.615.615 600.540 .542 800.420.445 900.360.390 1,000.305.335 1,100.260.295 1,200.220.255 1,300 1,400 1,500.185 .155 .125 .220 .190 .160 treated and hollow-bored. The same material is used forthe crank pins and driving and trailing a.xles which arealso hollow-bored. The

Note About Images