. Cross tie forms and rail fastenings with special reference to treated timbers . of the spike and not deeper than the length of the spikeexclusive of tin. head and the portion tapered for the point. The third objection to the ordinary spike is the necessity for fre-quent respiking. It has been indicated above that the length of timeduring which a spike will hold the rail to the tie and resist lateralpressure is liable to be very short with the soft woods. After severalyears the hole is widened to such an extent by the breaking of thesurrounding fibers that the spike becomes loose and no longe
. Cross tie forms and rail fastenings with special reference to treated timbers . of the spike and not deeper than the length of the spikeexclusive of tin. head and the portion tapered for the point. The third objection to the ordinary spike is the necessity for fre-quent respiking. It has been indicated above that the length of timeduring which a spike will hold the rail to the tie and resist lateralpressure is liable to be very short with the soft woods. After severalyears the hole is widened to such an extent by the breaking of thesurrounding fibers that the spike becomes loose and no longer is a common practice to day in such cases to pull such a spike andto drive it into the tie at some distance from the original hole. Theold hole is commonly plugged. Not infrequently spikes are driventwo or three times within a short distance of the same point. Thisrespiking is kept up until there is no more wood available at that par-ticular rail bearing. The tie must then be removed from the track, Bui. 50, Bureau of Forestry, U. S. Dept. of Agriculture Plate Fig. 1.—Section of Tie Under Rail Bearing, Showing Wear and Decay.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectwoodpre, bookyear1904
