train stations at paris cdg airport
There are two train stations (Gare) at CDG airport, 'Aeroport Charles de Gaulle1' near Terminal 3 within the 'Roissypole' complex, for the RER regional trains into Paris and 'Aeroport Charles de Gaulle 2 - TGV' within terminal 2 ( located between Terminal 2E and 2C) for both regional (RER) trains and TGV intercity trains.
If you are travelling to somewhere other than Paris and have chosen the TGV as your choice of transport what you need to do is to make your way to the train station (Gare) 'Aeroport Charles de Gaulle 2 - TGV' within terminal 2. This is for both regional trains (RER) and TGV trains.
Aeroport Charles de Gaulle 1 train station.
'Aeroport Charles de Gaulle1' (CDG1) is not, as you might expect, in terminal 1 but within the 'Roissypole Gare' complex that includes the rail and bus stations as well as access to the CDGVAL airport shuttle train.
At CDG 1 you can take the RER train into central Paris but you can't catch the TGV here - you need to go to 'Aeroport Charles de Gaulle 2 -TGV' for that.
Aeroport Charles de Gaulle 2-TGV train station.
'Aeroport Charles de Gaulle 2-TGV' (CDG2-TGV) is in the heart of terminal 2 between Terminal 2E and 2C.
Descend to Level 2 where you will find the ticket office for the station. The office is split into two sides, one side for tickets for Paris trains (RER B) and the other side for intercity trains tickets, which includes TGV trains.
There are also plenty of ticket vending machines. You have to use the Billetterie Ile-de-France vending machines (green here for some reason) and not the yellow SNCF TGV machines, as they do not sell tickets for the RER B. You must use a 'smart chip enabled' card at these machines or cash. They are 'touch screens' with multi-language choices and easy to use.