. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . produces a disturbance in theelastic wave running through the rails, the effect of which isnoticeable at high velocities. The greatest objection, however,lies in the dangerous consequences of a derailment or a failureof the timbers owing to unobserved decay or destruction byfire—caused perhaps by sparks and cinders from passing loco-motives. The very insignificance of the structure often leadsto careless inspection. But if a single pair of wheels gets off therails and drops int
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . produces a disturbance in theelastic wave running through the rails, the effect of which isnoticeable at high velocities. The greatest objection, however,lies in the dangerous consequences of a derailment or a failureof the timbers owing to unobserved decay or destruction byfire—caused perhaps by sparks and cinders from passing loco-motives. The very insignificance of the structure often leadsto careless inspection. But if a single pair of wheels gets off therails and drops into the pit, a costly wreck is inevitable. (b) Surface cattle-guards. These are fastened on top of theties; the continuity of the roadbed is absolutely unbroken andthus is avoided much of the danger of a bad wrecJ? owing to apossible derailment. The device consists essentially of overlay-ing the ties (both inside and outside the rails) with a surface on 262 RAILROAD CONSTRUCTION. §228. which cattle will not walk. The multitudinous designs for sucha surface are variously effective in this respect. An objection,. Fig. 108.—Sheffield CENTER SECTION r:^ END SECTION
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