. The science of railways . Y TELEGRAPH OPERATOR. yards and terminal points interlocking jDlantsare used, the principle applied here being an ar-rangement by which the switches are thrown bylevers placed in a tower and are operated byhand; the mechanism is so arranged thatswitches, where any two or more opened at thesame time might lead to a collision or derail atrain, are locked so only one can be opened,and to open a second one of the set the firstmust be closed. The signals for clear track or 19 Vol. 13 290 BUILDING AND REPjUBING RAILWAYS. danger are operated at the same time the switchis t
. The science of railways . Y TELEGRAPH OPERATOR. yards and terminal points interlocking jDlantsare used, the principle applied here being an ar-rangement by which the switches are thrown bylevers placed in a tower and are operated byhand; the mechanism is so arranged thatswitches, where any two or more opened at thesame time might lead to a collision or derail atrain, are locked so only one can be opened,and to open a second one of the set the firstmust be closed. The signals for clear track or 19 Vol. 13 290 BUILDING AND REPjUBING 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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