It controls and monitors on-board devices, including the passenger information system – displays, information monitors, voice announcements, ticket validators, on-board ticket machines. It supervises the passenger counting system and video monitoring system installed in the vehicle. XC – 4 controls the recording, storing and transmitting of data for controlled systems and the data obtained from them. It has a railwayman assistance system that identifies and informs about the departure time, compliance with the timetable and possible changes. XC – 4 receives and analyses the GPS signal. This control unit is dedicated to customers from the railway market.