The present invention pertains an overhead unit (1) for presenting information, gathering information, transferring information, lighting and/or alarm signals in an individualized manner in a carriage or fuselage, comprising a function module (2), a fixation module (3) for removably attaching the overhead unit to a rail, two receival modules (5a, 5b) for receiving signals, two transmission modules (4a, 4b) for sending messages and a processing module (6) for processing messages, whereby the receival modules and the transmission modules are operationally connected to the processing module, wherein the fixation module comprises a mechanical fixation system (7) configured to interlock with a fixation system of the rail, wherein the overhead unit comprises a proximal longitudinal end (9) and a distal longitudinal end (10), wherein the receival modules comprise a proximal receival module located at the proximal end of the overhead unit and a distal receival module located at the distal end of the overhead unit, whereby the receival modules each comprise a sensor, wherein the transmission modules comprise a proximal transmission module located at the proximal end of the overhead unit and a distal transmission module located at the distal end of the overhead unit, whereby the transmission modules each comprise a transmission source, wherein the processing module of the overhead unit is configured to receive signals via the receival modules from a neighbouring overhead unit or from a neighbouring control unit, and/or wherein the processing module of the overhead unit is configured to cause the transmission modules to send out signals to a neighbouring overhead unit and/or the control unit.