In accordance with the ERTMS/ETCS specifications, Subset 121, UIC 612 leaflet, ERA_ERTMS_015560 document, EN 50126 and EN 61375 series requirements, this Technical Report describes the Train Display System (TDS) in the driver´s cab, and the link between the TDS/TDC and some of its interfaces: The scope of this document is to define the functional architecture around the TDC. This Technical Report excludes the following items: - Communication protocols (e.g. EN 61375 series); - Ergonomic aspects; - Interface with ETCS (Subset 121); - Train functions; - GSM-R EIRENE functions; - Use of the displays as terminals for maintenance purpose.