This research is addressing whether a commercially viable train can be designed with improved stability such that it can remain on the track following high speed end-on collisions. The research has involved the development of computer models and no physical tests have been performed to validate these findings. Preliminary studies using multi-body dynamic models have highlighted the role of the coupler in promoting instability of trains. High coupler compressive collapse force in high speed impacts has been shown to reduce vehicle rake stability. A compromise is therefore required between the energy absorption requirements of low speed collisions and whole train stability in high speed collisions. Detailed finite element models of whole train designs have been developed which are capable of modelling the complex dynamics of laterally asymmetric collisions. This includes a specific model of the wheel-rail interface. These models are being used to explicitly model a range of collision scenarios to better understand the sensitivity of design parameters and to explore the limits of stability following an end-on collision.


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