. The science of railways . Fig. 244. PLAN ILLUSTRATING THE USE OF A CROSS OVER OR SWITCH CONNECTING THE TWO MAIN LINE TRACKS OF A DOUBLE TRACI^ ROAD. C IS THE CROSS OVER CONNECTING TRACKS A AND B TO ENABLE A TRAIN ON TRACK A TO REACH SIDING Fig. 245. PLAN OF A CROSS OVER. switch used in connection with an interlockingplant to protect railroad crossings is illustratedby Fig. 248. Guard rails should be placed at all frogs, bothat the main line rail and the rail leading to thesiding. They should be securely spiked to the CONSTRUCTI^G TRACK. 315 —4=fl444M J U L^

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1900