Saclay is served by no station of the Paris Métro, |RER]], or suburban rail network. The closest station to Saclay is Le Guichet station on Paris RER line B. This station is located in the neighboring commune of Orsay, 3.2 km (2.0 mi) to the south of the town center of Saclay.
Another station in the vicinity of Saclay is Vauboyen station on Paris RER line C, which is located in the neighboring commune of Jouy-en-Josas, near the northern border of the commune of Saclay. It is twinned with Ballincollig Co.Cork in Ireland