The design of a mechatronic real-time multibody model of a locomotive’s three axle bogie is presented in this paper based on the application of a software-in-the-loop approach. This approach requires development of different subsystems of the bogie test rig as real-time models. In this paper, the investigation of such a real-time application of the full model of the locomotive’s bogie test rig has been undertaken, where a mechanical subsystem has been created in Gensys multibody software and an electrical subsystem in the Matlab/Simulink environment transferred to an IPG Xpack 4 computerised system. The verification of the developed mechatronic model has been made by means of a real-time simulation process where two subsystems have been connected through the UDP interface.