. Building and repairing railways . TELEGRAPH OPERATOR. yards and terminal points interlocking plantsare used, the principle applied here being an ar-rangement by which the switches are tin-own bylevers placed in a tower and are operated byhand; the mechanism is bo arranged thaiswitches, where any two or more opened at thesame time might lead to a collision or derail a train, are locked BO only one can be opened,and to open a second one of the set the first mnst be closed. The signals for (dear track or 19 Vol. 13 290 BUILDING AND REPAIRING RAILWAYS. danger are operated at the same time the sw
. Building and repairing railways . TELEGRAPH OPERATOR. yards and terminal points interlocking plantsare used, the principle applied here being an ar-rangement by which the switches are tin-own bylevers placed in a tower and are operated byhand; the mechanism is bo arranged thaiswitches, where any two or more opened at thesame time might lead to a collision or derail a train, are locked BO only one can be opened,and to open a second one of the set the first mnst be closed. The signals for (dear track or 19 Vol. 13 290 BUILDING AND REPAIRING RAILWAYS. danger are operated at the same time the switchis thrown. Fig. 141 illustrates some of the sig-nals used on switch stands to indicate in the daytime clear track or danger; at night lanterns areplaced on the switch stands displaying a redlight for danger and a green light for clear track;it is not advisable to use a white light for cleartrack, as the white light in a lantern may betaken for the signal on a switch stand. The dif-ficulty with a switch light is to get one which.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
