This Deliverable D4.4 “Detailed running gear and wagon design concept” describes the detailed design of a new concept for the core market wagon design. Firstly, the needs and the challenges of the actual market for freight wagons are listed in order to address the objectives and define the target parameters for the new freight wagon. Different subsystems of the wagon are developed and virtually designed as 3D model to be assessed, comprehensively analysed and compared. The assembly is taken into account from the beginning to provide an easier implementation of the new concept. This document focus on:

• Wagon structure and chassis. The design of the wagon structure describes the coupling system, the adjustable end carriages, as well as the buffer compensation and it includes a structural analysis with different load schemes and boundary conditions.

• Bogies and wheelset concepts. For this part, the use of break disks as a breaking system is defined in order to significantly reduce the noise level, and this document presents investigations focused on novel wheelset design and materials. Therefore, it is important the definition of wheel material, axle material as well as definition of noise damping systems for wheels.