Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 497
nto boxes and bearings. The average length ofsleepers on the 4 8-J- gauge railways is about 8 feet; bearing surface, 7 ; dis-tance between centres, 2 to 2 G, except at joints, where they are as close to 480 ENGINEERING DRAWING. each other as the necessity of tamping beneath them will admit.… … cross section gravel ballast.Fig. 1129. Pennsylvania Eailroad, in which the width of cuts and top of embankments arethe same, 31 4, and other dimensions equally ample. Eail sections are of infinite variety and weights, adapted to the class ofrailroads on which they are to be used, and the loads and…
Mechanical drawing
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