From Gare de Lyon
RER A direction St Germain/La Defense and change at Chatelet to take the RER B direction of Robinson or St Remy les Chevreuse.
From Gare dâAusterlitz
RER C direction St Quentin or Plaisir and change at St Michel and take the RER B direction of Robinson or St Remy les Chevreuse.
From South or A86
From La Croix de Berny to Antony, then direction of Paris (along the N.20) for about 3 Km, then turn left as soon as you go up hill (on your right hand you’ve got a sherman tank from the 2°D.B.