. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . shall not be less than 50% of the ulti-mate. Added strength can only be obtained by using largerbolts or a more expensive metal. 294. Design of track-bolts. In Fig. 132 is shown a commondesign of track-bolt. In its general form this represents thebolt used on nearly all roads,being used not only with thecommon angle-plates, but alsowith many of the improved de-signs of rail-joints. The varia-tions are chiefly a general in-crease in size to correspond withthe increased weight of
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . shall not be less than 50% of the ulti-mate. Added strength can only be obtained by using largerbolts or a more expensive metal. 294. Design of track-bolts. In Fig. 132 is shown a commondesign of track-bolt. In its general form this represents thebolt used on nearly all roads,being used not only with thecommon angle-plates, but alsowith many of the improved de-signs of rail-joints. The varia-tions are chiefly a general in-crease in size to correspond withthe increased weight of rails,besides variations in detail di-mensions which are frequentlyunimportant. The diameter isusuaUy f to F; 1 bolts areused -for 100-lb. rails. As tolength, the bolt should not ex-tend more than | outside ofthe nut when it is screwed up. If it extends farther than this it is Hable to be broken off by apossible derailment at that point. The lengths used vary from3i, which may be used with 60-lb. rails, to 5, which is requiredwith 100-lb. rails. The length required depends somewhat onthe type of nut-lock Fig. 132.—Tbace-bolt. NUT-LOCKS. 295. Design of nut-locks. The designs for nut-locks may bedivided into three classes: (a) those depending entirely on an ^ 332 RAILROAD CONSTRUCTION, §295.
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