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 (Blue box and blue links only):[figure]Figure 1 - Functional architectureThe 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.