Greek railway signalling
On lines currently operated by the Hellenic Railways Organisation (OSE), signalling was not installed until World War II.[2] Today operations use four channels as follows: The suburban section from Acharnai Railway Center to the Athens International Airport station uses commercial TETRA radio instead of VHF/FM.Currently the VHF/FM system is being phased out and replaced with a digital communications network based on the GSM-R technology which shall also carry ETCS-Level 1 cab signalling.[3] In recent years the OSE undertook modernisation of the section from Piraeus to Thessaloniki and Idomeni.Signals are tagged with an identity which consists of a three- or four-letter code denoting the station and a number (for example "OIN 3").Details of the design and operation of the signals, the points, and the interlocking survive in Section D of the contract between the Greek Government and the railway company.[5] In 1924 the new company "Hellenic Electric Railways" signed a new contract with Siemens & Halske to renovate the signalling system.The line circuits operate with audio frequency alternating current (Siemens FTGS 17).[9] A VHF/FM simplex radio system, which operated on 161.325 and 161.375 MHz, was installed in stations and driving cabs in 1985.Signals are tagged with an identity which consists of a three-letter code denoting the station and a number (for example "ΣΥΝ 11").At some locations green wave signalling has been established, giving priority to approaching trams over road vehicles.All Athens Tram driving cabs are equipped with GPS receivers and TETRA radio telephones.
semaphoresGerman occupationRadio communicationdigital communicationHellenic Railways Organisationmorse-codetelegraphtelephoneDeutsche ReichsbahnEdessa StationGermanIdomeniAcharnai Railway CenterSiemenspassing loopswitch pointsAthens MetroHellenic Electric RailwaysSiemens & HalskeOmonoia stationKifissia stationEirini metro stationIndusiAutomatic Train Protectionline 1Automatic Train OperationSyntagma stationAthens Tramgreen waveHellenic Railways OrganizationRailway signallingBlock systemsAbsolute block signallingAutomatic block signalingCentralized traffic controlCommunications-based train controlDirect traffic controlEuropean Train Control SystemMoving blockRadio Electronic Token BlockTrack Warrant ControlTrain order operationSignalling controlBlock postIntegrated Electronic Control CentreInterlockingLever frameRail operating centreSolid State InterlockingWestlock InterlockingSignalsApplication of railway signalsCab signallingNorth American railroad signalsRailway semaphore signalAxle counterTrack circuitTrack circuit interrupterTreadleTrain protectionAdvanced Civil Speed Enforcement SystemAutomatic train controlAutomatic Train Protection (United Kingdom)Automatic train stopAutomatic Warning SystemAutomatische treinbeïnvloedingBaliseCatch pointsChinese Train Control SystemCityflo 650 CBTCContinuous Automatic Warning SystemContrôle de vitesse par balisesEBICABIntegra-SignumInteroperable Communications Based SignalingCrocodileKorean Train Control SystemLinienzugbeeinflussungPositive Train ControlPulse code cab signalingPunktförmige ZugbeeinflussungRS4 CodiciSelTracSistema Controllo Marcia TrenoSlide fenceTrain automatic stopping controllerTrain Protection & Warning SystemTrain stopTrainguard MTTransmission balise-locomotiveTransmission voie-machineLevel crossing signalsCrossbuckWigwagE-signalWayside hornAdtranzAlstomAŽD PrahaFederalGeneral ElectricGriswoldHitachiHyundai RotemMagneticProgress RailSafetranSmith and YardleyThalesUnion SwitchWestinghouse Brake & SignalWestinghouse Rail SystemsTransport CanadaAustraliaBavariaBelgiumCanadaFinlandFranceGermanyNetherlandsNew ZealandNorth AmericaNorwayPolandSweden