Régie Autonome des Transports Parisiens (Autonomous Operator of Parisian Transports) is the public transport company of Paris that runs most of the metro, tram and bus lines in the French capital as well as it is responsible for a part of the RER Network (Regional Express Network).
A guide to the Paris public transport system can be found here
Railway and trains
The SNCF (“National society of French railways”) is the French railway company that operates the country’s national rail services, including the TGV and France’s high-speed rail network.
The Transilien is the French railway network (the suburban railway services of the SNCF-owned railway network) linking Paris to its surrounding area mainly operating within the Île-de-France region.
The Paris RER is 5 express train lines connecting Paris city center to surrounding suburbs. Within Paris the RER acts as an express underground or subway train.
Licensed taxis have a sign saying “Taxis parisiens” on them. They don’t have a common color or type. All taxis apply the same rates. Recommended taxi services are:
Transport from/to the airport
* CDGVAL (Charles de Gaulle Véhicule Automatique Léger) is a free automatic shuttle rail service Paris Charles de Gaulle Airport consisting of two lines. Orlyval is a small automatic metro which runs a shuttle service to Paris’s Orly Airport.
* RoissyBus is a public transportation (RATP) shuttle connecting Paris and Charles de Gaulle airport
* RATP lines 350 and 351 are the cheapest way to travel between Paris and CDG but they have many stops.
* Bus Noctilien is a night bus service that facilitates travels in and around Paris, the Île-de-France region and departments.
* iD BUS is a long-distance coach service that links the major European cities.
Parking lots in Paris information can be found here.