X2RAIL-4 is the 4th project of the Shift2Rail members in the IP2 “Advanced Traffic Management & Control Systems” domain and it aims to continue the research and development of key technologies within the following Technology Demonstrators (TDs): -Railway line capacity increase (ATO up to GoA4)–TD2.2 (WP3, WP4, WP5): Finalize the activities started in X2Rail-1 by completing the GoA2 Specification. Develop ATO GoA4 prototypes. Integrate and test Obstacle Detection devices and “environment sensors” in cooperation with IP5 TD5.1.3. -On-Board Train Integrity–TD2.5 (WP6, WP7): Finalize the activities started in X2Rail-2. Define, develop and test complete On-Board Train Integrity system prototypes able to be applied in every train typology (i.e. Passengers and Freight trains with wired and wireless communication). -Traffic Management Evolution–TD2.9 (WP8, WP9, WP10): Finalize the activities started in X2Rail-2. Define, develop and test various elements of a Traffic Management System platform. Define and design a communication platform (Integration Layer) using standardized data structures and processes to manage the Communication/Data exchange between different services/clients and supporting TMS applications connected to other multimodal operational systems. -Smart radio-connected all-in-all wayside objects–TD2.10 (WP11, WP12): Finalize the activities started in X2Rail-1.Develop, implement and validate technical demonstrator. Develop and test prototype providing data exchange between trackside equipment and signalling devices via wireless connection; reduction of required cabling; increase on the availability of Maintenance Data, reduction of maintenance costs; support to preventive maintenance.