The board of Paris transport operator RATP has formally approved the draft plans for a southern extension of tram line T7 from Athis-Mons to Juvisy, where an interchange will be provided with RER lines C and D.

Being promoted by Ile de France transport authority STIF, the extension was originally planned to open in 2018, but is now expected to be completed by 2021. Running for 3·7 km, including around 900 m in tunnel, the extension will serve six stops in the districts of Athis-Mons, Paray-Vieille-Poste and Juvisy-sur-Orge. One stop would also be underground.

In order to serve the extension and increase peak services from 6 min to 4 min headways, RATP is planning to purchase 12 additional trams similar to the 19 Alstom Citadis 302 vehicles which operate on the existing line. This in turn will require an extension to the depot at Vitry to accommodate the extra stock. Under the proposals, RATP would act as project manager for the depot expansion and the necessary modifications to the T7 control centre, while STIF would oversee the rest of the extension works.