. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . le from a theoretical stand-point ; but whatever design is adopted, the trestle should evi-dently be sufficiently cross-braced for either a moving or astationary load, and any proposed design must be studied as tothe effect of hoth of these conditions. Some of the variousmethods of securing the requisite superelevation may be describedas follows: (a) Framing the outer posts longer than the inner posts, sothat the cap is inclined at the proper angle; axis o
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . le from a theoretical stand-point ; but whatever design is adopted, the trestle should evi-dently be sufficiently cross-braced for either a moving or astationary load, and any proposed design must be studied as tothe effect of hoth of these conditions. Some of the variousmethods of securing the requisite superelevation may be describedas follows: (a) Framing the outer posts longer than the inner posts, sothat the cap is inclined at the proper angle; axis of posts verti-cal. (Fig. 82.) The method requiresmore work in framing the trestle,but simplifies subsequent track-layingand maintenance, unless it should befound that the superelevation adoptedis unsuitable, in which case it could becorrected by one of the other methodsgiven below. The stringers tend totwist when the train is stationary. Fia. 8? (b) Notching the cap so that the stringers are at a differentelevation. (Fig. 83.) This weakens the cap and requires thatall ties shall be notched to a bevelled surface to fit the 172 RAILROAD CONSTRUCTION. 147.
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