Modelling energy consumption in diesel multiple units

[EN] This study presents a train simulation tool for the evaluation of a train journey and its energy consumption. The simulation tool consists of a train motion model and an energy consumption model, specifically developed for a diesel multiple unit. The underlying equations are numerically solved following the finite difference method. The models¿ performances are tested against a set of measured data including fuel consumption and speed profiles from real operation services. The results yield adjustment errors below 9% in all simulations, including simplified route profiles. The consideration of wind speed and direction further contributes to improve speed adjustment by 1.5% in those stretches where such variables are taken into account. Hence, the simulation tool can be used to predict the travel time and fuel consumption in any potential railway service even at an early stage design.