Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
This is an express commuter train service that consists of five lines named with the letters A to E. RER trains cover 8 zones, travelling within Paris and the greater Paris region, and are a fast and convenient way to travel around Paris. However, each line splits at certain points so you must be sure of the exact direction of travel before you board.
