I am landing CDG Terminal 2A. How do I get the RER train to Auber on the Red Line By | December 12, 2016 | in Vote Up 0 Vote Down Answered Public Public Private Questions Anonymous asked December 12, 2016 I am landing at CDG Terminal 2A How do I get the RER train to Auber on the Red Line near Opera 1 answer Vote Up 0 Vote Down Public Ben ⋅ Staff ⋅ December 18, 2016 RER B train from CDG to Chatelet Les Halles, transfer to RER A direction St-Germain-en-Laye / Cergy / Poissy until Auber station. #1 Please login or Register to Submit Answer Username or Email Address Password Remember Me