Yes, TGV Station at CDG is right in the middle of the HUGE airport complex. Getting there by bus from Terminal 1 ( The old terminal that UA, TW, US, BA, LH, SK use, to name a few,) could be some trip as the CDG Terminal bus is often very crowded and the bus ride makes alot of turns..... Also the bus stop at Terminal 1 is rather indiscernible. SO watch out for it!