Failsafe Operation
If a locomotive is unable to automatically retrieve temporary speed restriction information permanent speed restrictions will continue to be enforced. In the event of a total failure of the on board ACSES system the engineer may revert to the use of the cab signal system without civil speed enforcement. Both situations require permission to be obtained from the train dispatcher and are accompanied by additional maximum speed restrictions. In addition the ACSES system installed on Acela Express trainsets checks the status of the on board tilting mechanism and if the tilt is not functioning will revert to a lower set of track speeds.
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. If it is necessary to pass a signal at Stop after receiving authorization from the dispatcher ACSES will limit the train to 15mph within the interlocking limits after use of the Stop Release button. The ACSES system also supports direct dispatcher authorization of passing a Stop signal instead of the use of the use of a Stop Release button.
Read more about this topic: Advanced Civil Speed Enforcement System
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