TIU. Interface unit for train equipment. As part of the ERTMS project, it concerns different modules of standard interfaces between the train and the line. It includes a set of interfaces between the Automatic Train Control (ATC)and the different non-ATC on-board systems; these interfaces must be specific for each traction unit, since the on-board systems are generally different, but must have a single interface format in connection with the standard ERTMS system
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