Transilien Line V

Line V
Z 20844 train at Massy–Palaiseau
Overview
Termini	Versailles Chantiers Massy–Palaiseau
Connecting lines
Stations	7
Service
Type	Commuter rail
System	Transilien
Operator	SNCF
Depot	Trappes
Rolling stock	Z 5600, Z 8800, Z 20500, Z 20900
History
Opened	15 December 2024 (2024-12-15)
Technical
Line length	15 km (9.3 mi)
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrification	Overhead line, 1,500 V DC
Operating speed	100 km/h (62 mph)
Route map Versailles Chantiers      Petit Jouy–Les Loges Jouy-en-Josas Vauboyen Bièvres Igny Massy–Palaiseau     *   Route is not accessible (*) Under construction

Transilien Line V is a railway line serving the southwestern part of the Île-de-France region. It connects Versailles Chantiers and Massy–Palaiseau. It belongs to the Transilien network operated by SNCF, the French national railway. Unlike the other Transilien lines (with the exception of Line U), Line V lies completely outside the city limits of Paris.

Before December 2023, the line was operated as a branch of RER C. On 4 December 2023, the line was separated from the RER C and became a shuttle line, in preparation for the opening of the T12 Express tramway line on 10 December 2023. The line was officially designated line V on 15 December 2024.