It does not work during the special night service set up on the occasion of important events such as the Music Festival and New Year's Eve, between 1 a.m. and 5 a.m.
A study, published in the newspaper 20 minutes presented this link as the penultimate of Île-de-France in terms of respect for timetables, because it is a transverse link directly influenced by traffic from Montparnasse and Saint-Lazare networks and to be part of saturated traffic between La Défense and Saint-Cloud, and between Versailles-Chantiers and Saint-Quentin-en-Yvelines.
Names of codes Missions
The mission codes for line U of the Transilien consist of four letters. By appearing on the display screens (Infogare) and on the nose of the trains, they make it easier to understand the various missions carried out:
1st letter: destination of the train
2nd, 3rd and 4th letters
The last three letters make it possible to make the mission code pronounceable, since all the missions provide service to all the stations along the U line route.
Since 14 December 2014, the service on line U has been organized as indicated below, for each direction.
From Monday to Friday, from 6.30 a.m. to 9 a.m. and from 4.30 p.m. to 8 p.m., there is a train every quarter of an hour during rush hour. On Sundays, from 6.30 a.m. to 11 a.m. and every day from 8.30 p.m. to approximately 1 a.m., the offer is one train per hour.
The rest of the time, i.e. 5:30 a.m. to 6:30 a.m. and 9 a.m. to 4:30 p.m. Monday to Friday, 5:30 a.m. to 8:30 p.m. Saturday and 11 a.m. to 8 p.m. 30 on Sunday, a train every half hour is offered.
All the stations on the line are equipped with the "Infogare" information system, funded by the Île-de-France region and the Île-de-France transport union: screens located on the platforms and in the stations provide timely information travelers of the waiting time train as well as disruptions that may occur on the line.
On board the trains, a passenger information system indicates, in an audible and luminous manner, the stations served and the train's progress in real time on the line through the on-board passenger information system (SIVSE).
- D : La Défense
- V : La Verrière
Trainset
Currently, 22 in number, the Z 8800s are coupled in pairs (UM2) during peak hours, in order to be able to double the capacity. Since July 2015, four Z 8800 trainsets coming from the RER C have joined the staff of line U (i.e. 24 trainsets).
All the trains on this U line have the possibility of traveling on the N line (in particular to carry out the SOPI-POSI mission trains), the equipment being provided with the plans of the two lines.
Workshops
Line U rolling stock is maintained in the Trappes workshop, in Yvelines.
In March 2005, a new equipment maintenance workshop opened along the tracks of the Trappes yard in Yvelines, replacing an existing workshop, at a cost of close to twelve million euros, entirely financed by SNCF.
It is equipped with three tracks (two electrified and one non-electrified) with an inspection pit, one of which has a switchable 1,500/25,000 volts catenary. Elevating cradles allow work at height.
It also takes care of the maintenance of the twenty Z 5600 6 cars trainsets “Evolys” ,on line C of the RER and around sixty Corail cars. It also provides level 3 maintenance of TER 2N Center and Normandy. In addition, it has nearby a washing machine, a pit tower and a preparation site for cleaning and small maintenance operations.
Traffic
At the start of 2017, according to SNCF estimates, the number of passengers going up daily in the line's stations was 52,000 on a basic working day (Tuesday or Thursday), 16,000 on Saturday and 10,000 on Sunday.
