This work reviews the literature on models which integrate the network design and the frequency setting phases in public transportation networks. These two phases determine to a large extent the service for the passengers and the operational costs for the operator of the system. The survey puts emphasis on modelling features, i.e., objective cost components and constraints, as well as on algorithmic aspects. Finally, it provides directions for further research.
CitacióLópez-Ramos, Francisco. Integrating network design and frequency setting in public transportation networks: a survey. "SORT", Desembre 2014, vol. 38, núm. 2, p. 181-214.