This device makes possible the broadcast of pre-recorded messages both inside and outside the train in which the SAS is installed, for occurrences such as the opening and closing of the doors. Each SAS controls two doors and 4 speakers (2 internal, 2 external). It also makes it possible to prioritise train messages to prevent two messages from being broadcast simultaneously. These SAS will be used by the new Alstom TER trains, as part of the Regiolis Project.
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