. Railroad structures and estimates . es per mile on stone ballasted line where rails arelaid with staggered joints. Spikes. — Spikes are used to fasten or hold the rail to the ties;two kinds are in service, the ordinary common cut spike and thescrew spike. The functions of the spike are to prevent the railfrom spreading, overturning or lifting; the outer line of spikestherefore resists the lateral or side thrust, the inner line anchorsthe rail and prevents it from canting, while both lines simul-taneously hold the rail from lifting vertically from the waveaction which develops in the
. Railroad structures and estimates . es per mile on stone ballasted line where rails arelaid with staggered joints. Spikes. — Spikes are used to fasten or hold the rail to the ties;two kinds are in service, the ordinary common cut spike and thescrew spike. The functions of the spike are to prevent the railfrom spreading, overturning or lifting; the outer line of spikestherefore resists the lateral or side thrust, the inner line anchorsthe rail and prevents it from canting, while both lines simul-taneously hold the rail from lifting vertically from the waveaction which develops in the rail when under stress. The spike therefore is measured by its holding power and as thecut spike is not half as strong in this respect as the screw spikethe latter is undoubtedly the best fastening for the purpose, butthere are certain features in track maintenance and climaticconditions in this country that make it undesirable to adopt itunder all circumstances. not less than] jJ^j^^Y-^^ti?, Reinforced Not over ?,j Rad.^ preferred. 9^ All Spikes muet bo pcloted to %% outUiig odge, frc« of fins, andsball b« gruuDil If neocsparj. Fig. 56. C. P. R. Cut Track Sjnkes. Cut Spikes. — The common cut spike is in general use but islargely objected to on account of its limited holding power bothvertically and laterally and is thecause of the tie being rapidlydestroyed by spike killing, entailing thereby a very heavy main- TRACK SPIKES. W tenance cost in tio ivmnvals: so far as the latiM-al lioldiii^ powiM-of the spike is concerned the introduction of the tie plate liasgreatly strengthened it in this respect and for lines of ordinarytraffic it is doubtful if it will ever be (MitinOy by the
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