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
Overview
Termini	Paris-Saint-Lazare Ermont–Eaubonne Gisors Vernon–Giverny
Stations	54
Service
Type	Commuter rail
System	Transilien
Operator(s)	SNCF
Rolling stock	Z 50000 BB 27300 + VB 2N
History
Opened	26 July 1837 (1837-07-26) (first sections) 31 December 2004 (2004-12-31) (recreated as Line J)
Technical
Line length	256 km (159 mi)
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Route map Show static map Legend Gare Saint-Lazare Asnières-sur-Seine Bois-Colombes Houilles–Carrières-sur-Seine Colombes Le Stade Argenteuil Sartrouville Sannois Ermont–Eaubonne Val d'Argenteuil Maisons-Laffitte Cormeilles-en-Parisis La Frette–Montigny Herblay-sur-Seine Conflans-Sainte-Honorine Poissy Conflans-Fin-d'Oise Villennes-sur-Seine Maurecourt Vernouillet–Verneuil Andrésy Les Clairières de Verneuil Chanteloup-les-Vignes Les Mureaux Triel-sur-Seine Aubergenville-Élisabethville Éragny–Neuville Vaux-sur-Seine Saint-Ouen-l'Aumône Quartier de l'Église Thun-le-Paradis Pontoise Meulan–Hardricourt Osny Juziers Boissy-l'Aillerie Gargenville Montgeroult-Courcelles Issou–Porcheville Us Limay Santeuil–Le Perchay Chars Épônes–Mézières La Villetertre Mantes-Station Liancourt-Saint-Pierre Mantes-la-Jolie Chaumont-en-Vexin Rosny-sur-Seine Trie-Château Bonnières Gisors Vernon–Giverny Show diagram map

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]

• Paris-Saint-Lazare
• Asnières-sur-Seine station
• Bois-Colombes station
• Colombes station
• Le Stade station
• Argenteuil station
• Val d'Argenteuil station
• Cormeilles-en-Parisis station
• La Frette–Montigny station
• Herblay station
• Conflans-Sainte-Honorine station
• Éragny–Neuville station
• Saint-Ouen-l'Aumône-Quartier de l'Église station
• Pontoise station
• Osny station
• Boissy-l'Aillerie station
• Montgeroult–Courcelles station
• Us station
• Santeuil–Le Perchay station
• Chars station
• Lavilletertre station
• Liancourt-Saint-Pierre station
• Chaumont-en-Vexin station
• Trie-Château station
• Gisors station

• same route as the Gisors line between Paris-Saint-Lazare and Argenteuil
• Sannois station
• Ermont–Eaubonne station

• same route as the Gisors line between Paris-Saint-Lazare and Conflans-Sainte-Honorine
• Conflans-Fin-d'Oise station
• Maurecourt station
• Andrésy station
• Chanteloup-les-Vignes station
• Triel-sur-Seine station
• Vaux-sur-Seine station
• Thun-le-Paradis station
• Meulan–Hardricourt station
• Juziers station
• Gargenville station
• Issou–Porcheville station
• Limay station
• Mantes-Station station
• Mantes-la-Jolie station

• Paris-Saint-Lazare
• Houilles–Carrières-sur-Seine station
• Sartrouville station
• Maisons-Laffitte station
• Poissy station
• Villennes-sur-Seine station
• Vernouillet–Verneuil station
• Les Clairières de Verneuil station
• Les Mureaux station
• Aubergenville-Élisabethville station
• Épône–Mézières station
• Mantes-Station station
• Mantes-la-Jolie station
• Rosny-sur-Seine station
• Bonnières station
• Vernon–Giverny station

Line J utilises four-letter codes, called a mission code or the name of service. The four-letter code begins with a letter that designates the terminus of the station.^[2]

The first letter designates the train's destination.

• A: Argenteuil
• C: Conflans Sainte-Honorine
• E: Ermont-Eaubonne
• G: Gisors
• H: Houilles Carrières-sur-Seine
• J: Vernon
• K: Cormeilles-en-Parisis
• L: Les Mureaux
• M: Mantes-la-Jolie
• P: Paris Saint-Lazare
• T: Pontoise
• V: Vernon
• Y: Boissy-l'Aillerie

The second, third and fourth letters indicate the stations served by the train. Formerly, the second letter was used to designate the train type (I for express trains, A for semi-express trains, O for local trains), but this is no longer the case (but most all stops trains of Line J keep the O as the second letter). The third letter was also used to designate the route taken to the destination (for example C as a third letter indicates "via Conflans Sainte-Honorine"), but this is now abolished along with the second letter. Typically, mission codes or the name of services of line J have the following composition of destination, vowel, consonant, vowel (CARA, GENE, MOLE, PALE, TOCA, etc.) but only four codes follow the pattern of destination, vowel, consonant, consonant (PACK, PANS, TANS and VERN).

Line L
Overview
Termini	Paris-Saint-Lazare Cergy-le-Haut Saint-Nom-la-Bretèche–Forêt de Marly Versailles-Rive Droite
Stations	36
Service
Type	Commuter rail
System	Transilien
Operator(s)	SNCF
Rolling stock	Z 50000
History
Opened	26 July 1837 (1837-07-26) (first sections) 31 December 2004 (2004-12-31) (recreated as Line L)
Technical
Line length	76 km (47 mi)
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Route map Show static map Legend to Châtelet–Les Halles Gare Saint-Lazare Pont Cardinet Clichy–Levallois Asnières-sur-Seine Bécon-les-Bruyères Les Vallées Courbevoie La Garenne–Colombes Nanterre-Université to Nanterre-Ville La Défense Puteaux Houilles–Carrières-sur-Seine Suresnes–Mont-Valérien Sartrouville Le Val d'Or Maisons-Laffitte Saint-Cloud Garches–Marnes la Coquette Sèvres–Ville-d'Avray Vaucresson Chaville–Rive Droite La Celle–Saint-Cloud to Versailles-Chantiers Achères-Ville Viroflay-Rive-Droite Conflans-Fin-d'Oise Montreuil Neuville-Université Versailles Rive Droite Cergy-Préfecture Cergy-Saint-Christophe Bougival Cergy-le-Haut Louveciennes Marly-le-Roi L'Étang-la-Ville Saint-Nom-la-Bretèche–Forêt de Marly Show diagram map

The trains on Line L travel between Gare Saint-Lazare in Paris and the west of Île-de-France region, with termini in Cergy, Versailles and L'Étang-la-Ville. The line has a total of 290,000 passengers per weekday.^[3]

• Paris–Saint Lazare
• Pont Cardinet
• Clichy–Levallois
• Asnières-sur-Seine
• Bécon-les-Bruyères
• Les Vallées
• La Garenne–Colombes
• Nanterre-Université
• Houilles–Carrières-sur-Seine
• Sartrouville
• Maisons-Laffitte
• Achères-Ville
• Conflans–Fin d'Oise
• Neuville-Université
• Cergy-Préfecture
• Cergy-Saint-Christophe
• Cergy-le-Haut

• Same route as the Cergy line between Paris–Saint Lazare and Bécon-les-Bruyères
• Courbevoie
• La Défense
• Puteaux
• Suresnes–Mont-Valérien
• Le Val d'Or
• Saint-Cloud
• Garches–Marnes-la-Coquette
• Vaucresson
• La Celle-Saint-Cloud
• Bougival
• Louveciennes
• Marly-le-Roi
• L'Étang-la-Ville
• Saint-Nom-la-Bretèche–Forêt de Marly

• Same route as the Saint-Nom-la-Bretèche line between Paris–Saint Lazare and Saint-Cloud
• Sèvres–Ville-d'Avray
• Chaville Rive Droite
• Viroflay Rive Droite
• Montreuil
• Versailles Rive Droite

A four-letter code system is in use throughout Line L. These codes do not display on trains, but they are displayed on passenger information display systems.^[4]

The destination of the train is indicated by the first letter.

• B: Bécon-les-Bruyères
• D: Saint-Cloud
• F: Maisons-Laffitte
• N: Nanterre-Université
• P: Paris Saint-Lazare
• R: Marly-le-Roi
• S: Saint-Nom-la-Bretèche–Forêt de Marly
• U: Cergy-le-Haut
• V: Versailles-Rive Droite

The train type is indicated by the second letter.

• O: All stops
• A: Semi-express
• I: Limited stops
• U or E: Uses other stopping patterns

The route taken to the destination is indicated by the third letter.

• A: Asnières sur Seine
• B: Bécon-les-Bruyères
• C: Clichy–Levallois
• L: La Défense or Les Vallées
• M: Nanterre-Université
• P: Pont Cardinet

The fourth letter has no meaning, but it acts as a "padding" letter in order to make the code pronounceable.

• List of Transilien stations