Courcelle-sur-Yvette is a RER B station of Gif-sur-Yvette, near Paris, in France. It's also the name of a district of this town. An underpass was built in 1983 to connect the two sides of the way.
Wikipedia https://en.wikipedia.org/wiki/Courcelle-sur-Yvette_station
Address 24 Rue Fernand Léger, Gif-sur-Yvette 91190, France
Coordinates 48°42'3.168" N 2°5'57.164" E