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A central issue for operators of passenger trains is providing sufficient number of seats while minimising operating costs. This process must be conducted taking a large number of practical, railway oriented requirements into account. Because of this complexity, a stepwise solution was previously used, the result being the loss of optimality. The talk will present a new, integrated rolling stock planning model in which the many requirements are handled all at the same time. Preliminary results from DSB S-tog, the suburban train operator of the City of Copenhagen will also be presented.