. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . r 20 feet and excejitionallyup to 30 feet. For greater heights some such constructionas is illustrated in a skeleton design in Fig. 73 is used. Byusing split sills between each story and separate vertical andbatter posts in each story, any piece may readily be removed and 164 RAILROAD CONSTRUCTION. 138. renewed if necessary. The height of these stories varies, in different designs, from 15 to 25 andeven 30 feet. In some designs tliestructure of each storj
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . r 20 feet and excejitionallyup to 30 feet. For greater heights some such constructionas is illustrated in a skeleton design in Fig. 73 is used. Byusing split sills between each story and separate vertical andbatter posts in each story, any piece may readily be removed and 164 RAILROAD CONSTRUCTION. 138. renewed if necessary. The height of these stories varies, in different designs, from 15 to 25 andeven 30 feet. In some designs tliestructure of each storj is independentof the stories above and below. Thisgreatly facilitates both the original con-struction and subsequent repairs. Inother designs the verticals and batter-posts are made continuous through twoconsecutive stories. The structure issomewhat stiffer, but is much more diffi-cult to repair. Since the bents of any trestle are usually of variable height and those Fig. 73. heights are not always an even multiple of the uniform height desired for the stories, it becomes necessary to make the upper stories of unifoi-m height and let.
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