Traveling in France by rail is convenient, while french railways (SNCF) have a good reputation of ponctuallity.
All tickets are sold by the SNCF in the railway stations, city centers and on the Internet. There are many cheap prices for couples, families, elderly…
Here is the Web site of the french train company (SNCF) in english : http://www.voyages-sncf.com/dynamic/_SvHomePage?_CMD=cmdHomepageUK
Coming to France from England by Eurostar or from Benelux and Germany by Thalys
Eurostar and Thalys are beautiful and comfortable trains serving England and Benelux (Belgium, Amsterdam, Germany…)
Going from a big city to another : high speed train TGV
TGV is the high-speed train (300 kph), serving most of the french cities from Paris, but also Roissy-Charles de Gaule airport and from many big cities to others big cities.
Inside regions : regional trains or TER
From a town to another, you may take a TER train, which is a classical train.
Inside Paris : RER
Inside Paris and its suburbs, there is a subway but also a train network called RER.