Advanced Civil Speed Enforcement System
[1] It was installed beginning in 2000 on all of Amtrak's Northeast Corridor (except MTA territory) between Washington and Boston, and has been fully active since December 2015,[2] a few months after the 2015 Philadelphia train derailment which it would have prevented.[2] ACSES provides railway trains with positive enforcement of "civil" speed restrictions (those based on the physical characteristics of the line).The on-board components keep track of a train's position and continuously calculates a maximum safe braking curve for upcoming speed restrictions.This location information is utilized by the on-board systems when consulting its database of speed restrictions and track characteristics to calculate a real time braking curve.[3]: 352 Such information about the status of the track occupancy, switch position, signal indication, and a host of other vital inputs—is accumulated by wayside encoders, such as a Safetran VIU-ACSES (see photo to the right), before being sent to the BCMs for transmission to locomotives.In the event of a loss of all redundant standby systems (such as might occur due to a wide area power failure or communications failure with the central office) the system will indicate to the locomotive engineer that it has lost the ability to enforce temporary speed restrictions, but the permanent restrictions loaded into the on-board database will continue to be enforced.[3]: 350 Finally, the cab signals are considered a completely independent system that transmits a continuous stream of codes through the rails instead of via wireless transmission.[3]: 353 At interlockings where the Data Radio (BCM) is either not installed or not functioning, the train will determine if a positive stop is necessary via the cab signaling system.
positive train controlcab signalingAlstomcollisionswork crewsspeed restrictionstranspondersBalisestrack circuitsdigital radioAmtrakNortheast CorridorWashingtonBoston2015 Philadelphia train derailmentbrakespermanent wayautomatic train controlsignal systemPulse code cab signalingbackward compatibleSafetranantennadata radioAdvanced Train Control SystemHudson stationelectromagnetic fieldwaypointpacket switchesbackhaul networkinterlockingstransmissionofficeapproximationcomponentssubsystempower outagelightning strikeradio signallocomotive engineerEBICABRailway 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 protectionAutomatic train operationAutomatic train protectionAutomatic Train Protection (United Kingdom)Automatic train stopAutomatic Warning SystemAutomatische treinbeïnvloedingBaliseCatch pointsChinese Train Control SystemCityflo 650 CBTCContinuous Automatic Warning SystemContrôle de vitesse par balisesIntegra-SignumInteroperable Communications Based SignalingCrocodileKorean Train Control SystemLinienzugbeeinflussungPunktförmige ZugbeeinflussungRS4 CodiciSelTracSistema Controllo Marcia TrenoSlide fenceTrain automatic stopping controllerTrain Protection & Warning SystemTrain stopTrainguard MTTransmission balise-locomotiveTransmission voie-machineLevel crossing signalsCrossbuckWigwagE-signalWayside hornAdtranzAŽD PrahaFederalGeneral ElectricGriswoldHitachiHyundai RotemMagneticProgress RailSiemensSmith and YardleyThalesUnion SwitchWestinghouse Brake & SignalWestinghouse Rail SystemsTransport CanadaAustraliaBavariaBelgiumCanadaFinlandFrance