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1、InterlockingInrailwaysignaling,aninterlockingisanarrangementofsignalapparatusthatpreventsconflictingmovementsthroughanarrangementoftrackssuchasjunctionsorcrossings。Thesignalingappliancesandtracksaresometimescollectivelyreferredtoasaninterlockingplant。Aninterlocki
2、ngisdesignedsothatitisimpossibletogiveclearsignalstotrainsunlesstheroutetobeusedisprovedtobesafe。InNorthAmerica,theofficialrailroaddefinitionofinterlockingis："Anarrangementofsignalsandsignalappliancessointerconnectedthattheirmovementsmustsucceedeachotherinpropers
3、equence"。InterlockingtypesInterlockingscanbecategorizedasmechanical,electrical(relay-based),orelectronic/computer-based。MechanicalinterlockingInmechanicalinterlockingplants,alockingbedisconstructed,consistingofsteelbarsformingagrid。Theleversthatoperateswitches,de
4、rails,signalsorotherappliancesareconnectedtothebarsrunninginonedirection。Thebarsareconstructedsothat,ifthefunctioncontrolledbyagivenleverconflictswiththatcontrolledbyanotherlever,mechanicalinterferenceissetupinthecrosslockingbetweenthetwobars,inturnpreventingthec
5、onflictinglevermovementfrombeingmade。Inpurelymechanicalplants,theleversoperatethefielddevices,suchassignals,directlyviaamechanicalroddingorwireconnection。Theleversareaboutshoulderheightsincetheymustsupplyamechanicaladvantagefortheoperator。Crosslockingofleverswase
6、ffectedsuchthattheextraleveragecouldnotdefeatthelocking(preliminarylatchlock)。Electro-mechanicalinterlockingPowerinterlockingsmayalsousemechanicallockingtoensurethepropersequencingoflevers,buttheleversareconsiderablysmallerastheythemselvesdonotdirectlycontrolthef
7、ielddevices。Iftheleverisfreetomovebasedonthelockingbed,contactsontheleversactuatetheswitchesandsignalswhichareoperatedelectricallyorelectro-pneumatically。Beforeacontrollevermaybemovedintoapositionwhichwouldreleaseotherlevers,anindicationmustbereceivedfromthefield
8、elementthatithasactuallymovedintothepositionrequested。RelayinterlockingInterlockingseffectedpurelyelectrically(sometimesreferredtoas"all-electric")consistofcom
