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In this paper, a mathematical description will be given for a controlled pneumatic swing-plug train door. On the basis of the significant dynamics in the door system, a non-linear model is derived and implemented into the simulation package ‘SystemBuild'. Computer simulations of a closing procedure show that this non-linear model closely correlates with measured data of an experimental set-up. Linearization of the model gives rise to a drastic simplification. This linearized model is used to predict the influences of parameters on the door's behaviour.