. Electric railway journal . Zll tLCVATION. ^^ IA9 SCRBM —) O. ^H^ M-M N-N HN H- & Sujino (uiL %. LAB SCBEW uuuuuuuuu PROPOSED METHOD OF FASTENING GUARD TIMBERS TOTIES ON DECK OF WOODEN TRESTLES the view primarily of eliminating the bolts and sub-stituting lag screws. In its report for 1918 the com-mittee made recommendations which indicate that lagscrews may be safely and economically substituted forbolts in trestle decks, and stated that a test installation,with new materials both with bolts and lag screws inthe same trestle, indicated that the lag screw methodwithout dapping cost but 40 per
. Electric railway journal . Zll tLCVATION. ^^ IA9 SCRBM —) O. ^H^ M-M N-N HN H- & Sujino (uiL %. LAB SCBEW uuuuuuuuu PROPOSED METHOD OF FASTENING GUARD TIMBERS TOTIES ON DECK OF WOODEN TRESTLES the view primarily of eliminating the bolts and sub-stituting lag screws. In its report for 1918 the com-mittee made recommendations which indicate that lagscrews may be safely and economically substituted forbolts in trestle decks, and stated that a test installation,with new materials both with bolts and lag screws inthe same trestle, indicated that the lag screw methodwithout dapping cost but 40 per cent of the bolt-and-dapmethod. Meanwhile a maintenance period of two years de-veloped a reduction in cost of 94 per cent in favor of thelag screws, the maintenance consisting of tighteninglag screws or tightening bolts and replacing missingnuts and washers. The lag-screw type of deck construction as developedby the committee is shown in the accompanying figure,and the committee states that lining the track is greatlysimplified with this construction. Some seventeen steamrailroads have tried
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