We consider problems of (new) station placement along (existing) railway tracks, so as to increase the number of users. We prove that, in spite of the NP-hardness for the general version, some interesting cases can be solved exactly by a suitable dynamic programming approach. For variants in which we also take into account existing connections between cities and railway tracks (streets, buses, etc.) we instead show some hardness results.

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Kranakis, E, Penna, P. (Paolo), Schlude, K. (Konrad), Taylor, D.S. (David Scot), & Widmayer, P. (Peter). (2003). Improving customer proximity to railway stations.