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In this paper we describe the intelligent information systems that are used by the Dutch railway operator NS Reizigers for supporting its internal planning processes of generating efficient and robust duties for train drivers and guards. We focus on the TURNI system that provides real active support in creating such duties. The underlying model of the TURNI system is a set covering model with additional constraints, which is solved by applying dynamic column generation techniques, Lagrangeandoi:10.1109/hicss.2000.926668 dblp:conf/hicss/KroonF00 fatcat:3mgahh3wbfgydip6lw6k2vtd6e