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In the planning process of railway companies, we propose to integrate important
decisions of network planning, line planning, and vehicle scheduling into the task of periodic
timetabling. From such an integration, we expect to achieve an additional potential for
optimization.
Models for periodic timetabling are commonly based on the Periodic Event Scheduling
Problem (PESP). We show that, for our purpose of this integration, the PESP has to be extended
by only two features, namely a linear objective function and a symmetry requirement.
These extensions of the PESP do not really impose new types of constraints, because practitioners
have already required them even when only planning timetables autonomously without
interaction with other planning steps.