The SCRIPT project aims at characterizing and answering robustness problems in the design of railway transport plans. The first objective will be to define the relevant indicators for modeling the stability of a plan from the point of view of the users and customers as well as from the point of view of the railway company. The project then aims at proposing innovating methods that determine optimized stable plans compared to a typology of risks, and at validating these methods with a simulator integrating the various risks on real data. This project falls in the thematic axes 3.2 (“gestion des réseaux de transport”, i.e. management of transport networks) and 3.3 (“productivité et services”, i.e. productivity and services) of the call for projects for 2012 of the TDM program. The originalities of the project are multiple. First, the goal is to analyze stability with the double vision customer, mainly concerned with quality of service, and Railway Company, whose primary focus is on costs. The study will consider French customers, whose expectations can be quite different from those of customers in other countries. Secondly, all the critical resources necessary to implement a transport plan will be considered: Train paths, rolling stock and train drivers. A complete network will be considered with its connections with other networks. Lastly, to undertake this research, the project lies on a consortium made up of two complementary laboratories on the problems of robustness, optimization in transportation and simulation, and the main actor of the rail transport in France.