. Building and repairing railways ... : Forming one of the series of the volumes comprised in the Revised and enlarged edition of The science of railways, . rd burntbricks cannot be secured and a first-class pave-ment must be laid granite or trap blocks shouldbe used. SIGNALS.*^ The method of signaling to adopt will dependon the amount of traffic and number of light business can be handled by signals dis-played at telegraph offices indicating clear trackor a stop required for train orders; such signalsare operated by hand by the operator from theoflBce. Fig. 198 represents a style of
. Building and repairing railways ... : Forming one of the series of the volumes comprised in the Revised and enlarged edition of The science of railways, . rd burntbricks cannot be secured and a first-class pave-ment must be laid granite or trap blocks shouldbe used. SIGNALS.*^ The method of signaling to adopt will dependon the amount of traffic and number of light business can be handled by signals dis-played at telegraph offices indicating clear trackor a stop required for train orders; such signalsare operated by hand by the operator from theoflBce. Fig. 198 represents a style of this kind. Where there are a number of fast trains someautomatic system should be resorted to; in thiscase the power to operate the signals is obtainedfrom electric batteries and the circuits are openedand closed by the passing trains. Fig. 199 illus-trates the signal used—a white disc indicates thetrack is clear to the next signal or block, a redone indicates the train has not yet reached thenext signal or block. Fig. 200 shows the lever * The subject of signal!ag is fully treated in the volume, Train Service. 314 BUILDING AND HEP AIRING
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1906
