Your lines evolve and are renumbered at Saint Germain Boucles de Seine!

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New services, simplified routes, new numbering... From 13 July, your lines are evolving to adapt to your needs. With new numbers, simpler, more readable journeys and reinforced connections, your new bus offer will save you time on a daily basis.

Your lines are evolving and are being renumbered at Saint Germain Boucles de Seine.

With your new bus offer on Saint Germain Boucles de Seine, save time on your daily journeys:

  • Enhanced connections
  • More direct routes
  • More buses during rush hour
  • Renumbered lines for readability

A new bus offer that hits the nail on the head

Simplified routes, adjusted services and increased frequencies on certain routes improve the readability and efficiency of your lines.

These changes concern the heart of the territory where lines R1, R2N, R2S, R3N, R3S, R4, R5 and 10 give way to lines 6301, 6302, 6304, 6305, 6306 and 6307.

These new lines are being redesigned to better serve the main districts, stations and places of interest in the area.

Equivalence of lines, old lines - new lines.

And line numbers that are (finally) becoming unique

In parallel with the changes affecting the heart of the territory, several lines are simply being renumbered.

New numbers of the other lines in the territory of Saint Germain Boucles de Seine.

Why is the number of your bus line changing?

The bus network in Île-de-France is made up of nearly 1,900 lines, and the current numbering system means that there are many lines with the same number. Île-de-France Mobilités wants to improve the readability of the regional bus network, by working on the numbering of bus lines so that each one has a unique number.

How to find your way among the new numbers?

Île-de-France has been divided into departments and sectors, each of which has a specific code.

In the territory of Saint Germain Boucles de Seine, all your lines are now renamed from the area code "63" (example: line 9 becomes line 6309).

Throughout the Île-de-France region, Express lines are assigned a code for their department followed by their own number (example: the A14 Express line becomes line 7824). These changes will be effective from July 13, 2026.

To find out more about the news in your area, visit our X @StGermain_IDFM account and the Bus Saint Germain Boucles de Seine Facebook page.