The main goal of this thesis is to build a mathematical model of a Gblss-y freight wagon with the Powell Duffryn TF25SA running gear which corresponds reasonably to reality. The model is verified with dynamic vehicle reactions measured on track.

The TF25SA running gear allows a maximum speed of 160 km/h with an axle load of 20 tons. The running gear is tested in Sweden according to UIC 518 and used on Gblss-y freight wagons by Green Cargo in overnight postal transport.

Necessary information and data on the running gear have been provided by Powell Duffryn Rail.

Necessary data on the measurements have been provided by TrainTech Engineering Sweden AB.

Data on the track irregularities have been provided by the Swedish National Rail Administration, Banverket.

The present vehicle model is build in the simulation software GENSYS as a rigid multibody model including the carbody. Also the track is modelled.

In this thesis studies have been carried out to examine the vehicle’s comfort characteristics and its behaviour on different tracks.The model give reasonable results concerning vertical and lateral dynamics. However the model does not agree that well with the measurements concerning ride comfort characteristics in the lateral direction.