. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . are fastened to that part of the truck that is deflectedleast, and hence varies least in height when the load onthe car changes. The shoe beam must, therefore, be hungfrom a point that is not responsive to the action of themain-truck springs. On account of this comparativelyrigid suspension of the shoe beam, with its contact shoes,it is absolutely essential that the surface line of the thirdrail be true and level and that the tops of the rails atjoints be exactly flush; if they are n
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . are fastened to that part of the truck that is deflectedleast, and hence varies least in height when the load onthe car changes. The shoe beam must, therefore, be hungfrom a point that is not responsive to the action of themain-truck springs. On account of this comparativelyrigid suspension of the shoe beam, with its contact shoes,it is absolutely essential that the surface line of the thirdrail be true and level and that the tops of the rails atjoints be exactly flush; if they are not, as experience hasproved, there will be no end of trouble from losing contactshoes. As a factor of safety, it is well to make the slottedlinks, by means of which the steel shoes are hung from thesteel rack, of gray cast iron, so that in case the passage ofthe shoe along the rail becomes obstructed for any reason,the links will give away and the rack and beam will bespared. 00 ELECTRIC RAILWAYS 22 62. Fig. 65 shows the style of contact shoe used on theAlbany and Hudson third-rail road. It will be noticed. iz3
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