Transilien Paris-Saint-Lazare is one of the sectors in the Paris Transilien suburban rail network. The trains on this sector depart from Gare Saint-Lazare in central Paris and serve the north and north-west of Île-de-France region with Transilien lines "J" and "L". Transilien services from Paris to Saint-Lazare are part of the SNCF Saint-Lazare rail network.
The two lines are the busiest lines in the Transilien system, excluding lines signed as part of the RER.
Line J
The trains on Line J travel between Gare Saint-Lazare in Paris and the north-west of Île-de-France region, with termini in Ermont–Eaubonne, Gisors and Vernon. The line has a total of 260,000 passengers per weekday.[1]