. Electric railway journal . ied by a postin the center of the car and braced with insulated steelrods which run to each end and are located so as not tointerfere with material carried. Pneumatic tie-tamping outfits have not only increasedthe output of work per man in this particular but haveimproved the quality of work done. Their best work isaccomplished when rock or slag ballast is used, althoughthey may be used successfully with gravel or cinderballast under careful supervision. The utility of thesemachines is not confined to tamping ties. With apointed tool, brick or granite block pavemen
. Electric railway journal . ied by a postin the center of the car and braced with insulated steelrods which run to each end and are located so as not tointerfere with material carried. Pneumatic tie-tamping outfits have not only increasedthe output of work per man in this particular but haveimproved the quality of work done. Their best work isaccomplished when rock or slag ballast is used, althoughthey may be used successfully with gravel or cinderballast under careful supervision. The utility of thesemachines is not confined to tamping ties. With apointed tool, brick or granite block pavement withgrouted joints may be quickly removed, and the blocksor bricks cleaned. The concrete track foundation alsomay be rapidly broken up, using a small part of theforce of men otherwise necessary. An illustration showsan experimental outfit built several years ago. A com-pressor that was being displaced in the shops wasmounted on a car and a small air tool purchased. Thetool was not of sufficient size, but the work performed. LARGE CONCRETE MIXER OPERATING ON TRACKBEING CONCRETED March 19, 1921 Electric Railway Journal 521 was more than equal to that of four men engaged inthe same work of removing concrete paving founda-tion. In connection with the use of thermit welding, orwhere compressed air is used in any manner, this ma-chine becomes a valuable adjunct. Small Concrete Mixer Has Its Place The small concrete mixer with a capacity of a quar-ter yard or less has a distinct place with all companieshaving a considerable mileage in paved streets. Itshould be equipped with a loading skip and preferablyshould be gas driven. The electric drive restricts theuse of the machine to areas served by the electric cir-cuits furnishing the proper voltage for the motor. Themachine is scarcely large enough to use on extensivenew paving work, but will rapidly pay for itself onpaving repairs and in the construction of the numeroussmall concrete jobs that originate in the power houseor shops. Whe
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