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1、B345X16SIGNALSQuestionsandAnswersabouttheSignalsinusebytheTorontoTransitCommission1.01ControlLength--thePurposeofSignalsQ.Howdosignalsknowwhentochangeandwhatismeantbycontrollength?A.Thecharterofrapidtransitisevidentinitsname:tomovepeoplesafelyasrapidlyaspossible.Whil
2、etrains,motors,andpropulsionpowerareresponsiblefortherapidity,signalsareresponsibleforthesafety.Arapidtransitsignal'sjobistokeeptrainsatasafedistancefromdangers,includingeachother,viathreeclosely-relatedfunctions,*Toindicatetotrainoperatorswhetherthetrackaheadisclear
3、,*Toinstructthetrainoperatortoproceed(green),proceedpreparedtostopatthenextsignal(yellow),ortostop(red),accordingly,and*Toforciblystopatrainviaitstrainstopshouldthattrainfailtocomplywithanindicationof"stop."Anextentoftrackbeing"clear"meansthatitisprovenfreeofdangerss
4、uchasothertrains,trailing-pointswitchessetthewrongway,conflictingroutesfromothersignals,andsoon.Theextentoftrackaheadofagivensignalforwhichitmakesthischeck,whichisdifferentfordifferentsignals,iscalleditscontrollength,asitcontrolsthesignal'sindication.If,atagiventime,
5、anyofthesedangersappearwithinanyportionofasignal'scontrollength,thatsignalisrequiredanddesignedtodisplayanindicationof"stop".A"clear"indicationconfirmstheprovenabsenceofdangerswithinasignal'scontrollength.Signalsareplacedregularlyalongatrack,atinsulatedjoints,subject
6、toconsiderationstobediscussed.Eachsignal'sindicationinstructsthetrainoperatorwhattodouptothenextsignal.Anindicationof"proceed",or"proceedpreparedtostopatnextsignal"isonlyvalidupuntilthenextsignal,whenthatsignal'sindicationassumesvalidity.Considerthefollowing"singleli
7、ne"signalingdiagram.Asperstandard,thelinesunderthetrackstartinginlittlecirclesatsignalsandendinginarrowsrepresentthosesignals'controllengths.The"lazyhouse"shapedobjectrepresentsastoppedtrain.Thebigarrowindicatesthedirectionoftraffic.Thesignalshereare200'apart.T239T24
8、1T243T245T247T249B241B243B245B247GRNGRNYELLOWREDHere,eachsignaliscontrolledsolelybytheoccupancyofthe"block"infrontofit,extendingtot
