Paris Travel Guide - HTML5

you'll have to let one or two trains pass before being able to board. If you can help it, avoid Métro lines 1, 4, 9, & 13 and RER lines A & B during rush hours as these are the most congested lines in the system.  In addition to RER, there are many suburban train lines (Transilien) departing from the main train stations.  Two lines of interest are line L from Other lines Gare Saint-Lazare to Versailles Rive-Droite and line N from Gare Montparnasse to Versailles- Chantiers , a quick way to go to Versailles castle (covered by a ticket for at least Zones 1-4). The train from Saint-Lazare stops at La Défense