Under the European Rail Joint undertaking, the European Union is transitioning from conventional screw-side buffer couplers to digital automatic couplers in freight trains. Conducting a large number of experiments to assess performance and develop maintenance practices is impractical. Therefore, simulation frameworks are being developed to assess various train configurations and operational conditions, with wagons equipped with digital automatic couplers. In a similar effort, under EU Rail Flagship project TRANS4M-R, the KTH Rail Vehicles group is developing a three-vehicle model simulation framework, for which multibody dynamic models of common European wagons, particularly Y-25 bogie-based wagons, need to be developed.

The bogie model has been developed in the multibody-software platform SIMPACK©. First, an extensive literature research was carried out in this thesis to realize the bogie design and to identify the dynamically important structures of the bogie and the connection elements. As well as to understand and learn the structures of modelling in multibody-software. An Y-25 bogie model available with another multibody-software GENSYS© has also been taken as reference for geometric and inertial parameters. Two Y-25 bogies were assembled with a wagon model. Car accelerations and wheel-rail contact forces was compared with those of GENSYS model under same design and operational conditions. A good match of SIMPACK model results have been found with GENSYS model.