. Elements of railroad track and construction . nder control, which is sometimes necessarj^ when re-surfacing track; a white flag means all clear. The lanterns used on a section are usually red andwhite, and two, the number mentioned in the table,seem a very inadequate supply for a section. In case ofa washout it is quite possible for both tracks to be out ofservice, in which case two red lanterns, one on eachtrack, will be necessary. 166 RAILROAD TRACK AND CONSTRUCTION. 177. Hand- and Push-cars.—Hand-cars consist of aplatform mounted upon four wheels and driven by arack and lever attached to
. Elements of railroad track and construction . nder control, which is sometimes necessarj^ when re-surfacing track; a white flag means all clear. The lanterns used on a section are usually red andwhite, and two, the number mentioned in the table,seem a very inadequate supply for a section. In case ofa washout it is quite possible for both tracks to be out ofservice, in which case two red lanterns, one on eachtrack, will be necessary. 166 RAILROAD TRACK AND CONSTRUCTION. 177. Hand- and Push-cars.—Hand-cars consist of aplatform mounted upon four wheels and driven by arack and lever attached to two bars. These bars are aslong as the car is wide and stand at right angles to thetrack-; the bars are pumped by six men, three facingforward and three backward. Hand-cars must havean efficient brake, and have hand-holds at each cornerof the car, so that they can be lifted to and from the hand-car is used to carry the section gang and toolsto and from their work. Push-cars consist of a plain platform mounted on four z.\<^ g iw^. Fig. 100. wheels, and are used to carry ties and rails to the pointwhere they are to be laid in track. Both of these carsare essential on all sections, except that the hand-car isnot necessary in yard work. The longer the section,the greater the necessity for a good hand-car. 178. Track Gauge.—The two essentials of a trackgauge are—(1) that it shall be forked on one end, as shov/nin the plan. Fig. 100, and (2) that the projections shallf\t against the gauge of the rail and give the requiredgauge of In the elevation, Fig. 100, three pro-jections are shown: the outer projections give the gaugeof track, and the projection A gives the proper spacing, MAINTENANCE OF WAY. 167 If inches, of guard rails from the main rail. The facesa b should be vertical for the A. S. C. E. section, andshould have the direction of the side of the head of railin use. The curve c is to prevent a flow of metal in thehead of the rail from preventing its
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