SNCF (Societé Nationale des Chemins de Fer Français) is France's national railway company, owned by the French state, operating throughout continental France and Monaco. There are over 32,000 kilometres of railway laid all across the country, a good chunk of them sustaining high-speed services, the world-renowned TGV (Train à Grande Vitesse) which reaches average speeds of around 320km/h. Trains connect cities and towns all around France and even cross the border into Spain, Italy, Switzerland and Belgium. Many routes will begin in Paris, stopping at convenient stations throughout the country before arriving in Dordogne. The SNCF website has information for TGV and national rail service timetables. TGV train tickets must be bought in advance and there are a whole host of special offers available for families, seniors, and groups throughout the year. Tickets can be purchased online or at any train station in France.
Accessing the Dordogne area from Paris by train will find you travelling through central France to Brive, Bergerac or Perigueux, all located in the Dordogne Valley. Once you reach the Dordogne, however, onward travel throughout the region by train can be fairly difficult. The train line that runs the length of the Dordogne valley does not stop at each town and you will find the trains infrequent.