Validation of multi train simulation software

The development of new simulation software must include validation with real or known data if it is to achieve full credibility. In the case of fully integrated multi train simulators the validation can be complex as it involves verifying both the train movements´ parts of the simulator together with the electrification system elements. Multi train simulators can create unreasonable expectations from both users and railway authorities inexperienced with the limitations of simulations. The validating of a Multi Train Simulator serves to demonstrate that the simulator is behaving as expected and to build confidence for the user. Validation is the term given to ensuring that the simulator is providing the results expected and can be carried out through calculation alone but this is unlikely to provide the confidence that is expected by railway authorities. It is often difficult to achieve true and comprehensive validation of multi train simulation software without the co-operation of a railway authority or operator. The challenge of validating a multi train simulator is not made any easier as client and public expectations of new rail transit systems require the railway designers to incorporate more versatile and sophisticated electrified railway and tram networks. This paper seeks to explain the challenge of validating a multi train simulator, including the train movements, electrification system and rail potentials. Additionally the paper will review the technical necessities of validating multi train simulators.