The two adjacent vehicles or carriages (1.1,1.2) have a plug-and-socket connection (5) for data bus lines (3.1,3.2) in the two adjacent vehicles. The bus lines connect control modules (7,1,7.2) which are in turn connected (4.1,4.2) to internal bus lines (2.1,2.2) for the vehicles. These bus lines are connected to radio transmitter-receiver units (6.1.1-6.2.2), sending radio data transmission signals (8) across the gap between the two adjacent vehicles.
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