The answer : you will find it : http://www.transilien.com/web/site/lang/en
From Gare du Nord to Saint-Lazare, the only direct liaison is the RER underground train, line E. Follow the signs for "RER E - Haussmann - Saint-Lazare'.
Wikimedia lists at least three variations of the same scene as painted from two distinct perspectives by Monet around 1877: "Arrival of the Normandy Train, Gare Saint-Lazare," "The Gare Saint-Lazare: Arrival of a Train," and simply "Gare Saint-Lazare" or "Saint-Lazare Station."
Vous prenez le train
Gare Saint-Lazare was created in 1837.
The RER is a Paris suburban train service. It does not go to Le Havre. You can go from CdG to Gare du Nord on the RER, from Gare du Nord to Gare Saint-Lazare on the metro, and from Saint-Lazare to Le Havre by train. The SNCF website will help you with this.
Gare Saint-Lazare; 26.30 euros each way
It's not on the metro. RER line C to Versailles Rive Gauche is most convenient. The station is 800 metres from the palace. There are also SNCF trains from Gare Montparnasse to Versailles Rive Gauche, and from Gare Saint-Lazare to Versailles Rive Droite. There's even a train to Versailles Chantiers, but that's even further away. The 171 bus from metro Pont de Sèvres goes to the palace itself.
There are 6, Gare du Nord, Gare de l'Est, Gare Saint-Lazare, Gare Montparnasse, Gare de Lyon, Gare d'Austerlitz and Gare de Bercy. Each station serves a different part of France.
RER E from MAGENTA
In 1873.
la Gare du Nord, la Gare de l'Est, la Gare de Lyon, la Gare d'Austerlitz, la Gare Montparnasse, la Gare Saint-Lazare
Eurostar to ParisEurostar trains run from London, Ebbsfleet or Ashford to Paris Gare du Nord.Eurostar runs from London Waterloo to Paris in approximately 2 hours 40 minutes.Check in for all Eurostar destinations is 30 minutes before departure. You will need a passport for travel, and a visa where necessary. Paris to VersaillesFrom Paris Gare du Nord (where Eurostar arrives) take a taxi or the metro across Paris to Gare St Lazare then take a local train to Versailles Rive Droite. Trains run every 15 minutes and journey takes 35 minutes. The latest time we suggest you arrive into Paris is 19.00 for your transfer to Versailles. UpgradesUpgrade to Leisure Select (First Class) on Eurostar including complimentary drinks, meal and a spacious seat from £39 per person each way.