. Railroad structures and estimates . or supporting scale platform has been virtually aban-doned, having been replaced very largely by all-metal con-struction. 392 TRACK SCALES. Track Scales, Lake Erie. — The dead rails are supported in-dependent of the weighing mechanism on steel, 12-in. framed to cross girders. The main hne rail girders are24-in. 80-lb. I-beams, on which rest the cast pedestals thatsupport the double rail beam track. The main levers are of cast iron with 12-in. load and fulcrumpivots and 4J-in. tip pivots. The main lever stands are placed directly on concrete f
. Railroad structures and estimates . or supporting scale platform has been virtually aban-doned, having been replaced very largely by all-metal con-struction. 392 TRACK SCALES. Track Scales, Lake Erie. — The dead rails are supported in-dependent of the weighing mechanism on steel, 12-in. framed to cross girders. The main hne rail girders are24-in. 80-lb. I-beams, on which rest the cast pedestals thatsupport the double rail beam track. The main levers are of cast iron with 12-in. load and fulcrumpivots and 4J-in. tip pivots. The main lever stands are placed directly on concrete founda-tion. The pit is large and is entered by a stairAvay from thescale office. The weighing beam is graduated by 20 lb. up to2000 lb., with 50 lb. poise. Deck is built of steel plates restingon the walls of the pit rather than on the scale itself. C. P. R. Track Scale. — Figs. 195 and 196 are known as theextra heavy type 100 and 150-ton capacitj^ steel frame. Thescale is constructed on a system in which a series of transverse. I Fig. 195. Cross Section, C. P. R. Track Scale. or main levers transmit the load to a line of longitudinal exten-sion levers, which in turn transmit to the 5th lever and thenceto the weighing beam. The main lever stands are set directlyon the concrete foundation; the scale is equipped with steeltransverse girders to support the dead rail so that the trafficover them in no way affects the weighing mechanism. Thescale may be built level or on a per cent grade if motionweighing is desired. The foundations are of concrete and the main girders of steel;the main levers are of cast steel and the pivots and bearings of TRACK SCALES. 393
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