Thanks to EU and French state founding, SNCF Réseau, the French Railway Infrastructure Manager start to develop an open source project (www.osrd.fr) with 40 peoples. But SNCF Réseau's challenge is to keep pace with the decarbonization of transport, and thus ensure more traffic, by optimizing infrastructure investments. If we want to be competitive with air and road, we need to have the most efficient railway system. These investments require long studies, simulation tool to design the right infrastructure delivering the expected services. This challenge is shared by all the infrastructure managers and the tools different and closed. We decided to propose a commun tool to improve the quality of the studies and the transparency of the usage of public money both for the software and the infrastructure. Collaboration with other infrastructure manager around OSRD is already planned to add value in the software but also in the business. Here is our Github: https://github.com/osrd-project