Railway companies Paris 1st 75001

Owned by SNCF, Transilien is the network operating in Paris and the Ile-de-France region. There are 15 lines covering a network of almost 1,300 kilometers criss-crossing the region. Of these 15 lines, 2 are operated with RATP (RER A and B), and some others are tramway lines (4, 11, 12 and 13). If all this seems a bit confusing, it's much simpler when it comes to fares: the regulatory authority, Ile-de-France Mobilités, is responsible for applying a common fare structure, and tickets are readily available.