. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . «h- FiG. 156. 300 RAILROAD CONSTRUCTION. 217. of feet for straiglit track. Since it is slightly more for aturnout to the outside of a curve, it may be called Then „ (54. oy 8 X ^ ^^^^ ^^®* ^^^ ^^ ^^^ ^^ = ^-21foot. CROSSINGS. 277. Two straight tracks. When two straight tracks crosseach other, four frogs are necessary, the angles of two of thembeing supplementary to the angles of the other. Since suchcrossings are sometimes operated at hi
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . «h- FiG. 156. 300 RAILROAD CONSTRUCTION. 217. of feet for straiglit track. Since it is slightly more for aturnout to the outside of a curve, it may be called Then „ (54. oy 8 X ^ ^^^^ ^^®* ^^^ ^^ ^^^ ^^ = ^-21foot. CROSSINGS. 277. Two straight tracks. When two straight tracks crosseach other, four frogs are necessary, the angles of two of thembeing supplementary to the angles of the other. Since suchcrossings are sometimes operated at high speeds, they should be. SECTION ON A-B SrCTION^ON OD Fm. 157.—Crossing, very strongly constructed, and the angles should preferably be90° or as near that as possible. The frogs will not in o-eneralbe stock frogs of an even number, especially if the anglesare large, but must be made to order with the required anglesas measured. In Fig. 157 are shown the details of such a cross-ing. Note the fillers, bolts, and guard-rails. §279. SWITCHES AND CIIOSSINGS. 301 278. One straight and one curved track. Structurally thecrossino: is about the same as above, but the froir aiiirles areall unequal. In Fig. 158, 7? is known,and the angle J/, made by the centerlines of the tracks at their point of inter-section, is also known. J/ = XCM. SC = n COS cos J/+ \(j COS i^,= 7?- i^ o. .1 1 7^ ^C0SJ/+^^ Similarly cos r „ = Trv~y— ■ R cos M— \(j ^ R cos 2f— ^g cos F,=z —p—z;,—• ^(129)
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