Poissy – Les Mureaux bus network

Development of lines operated by Transdev Autocars Tourneux

On January 1, 2009, lines 3, 12, 22, 26, 30, 31, 32, 33, 35, 37 and 39 were transferred to Autocars Tourneux.

On January 4, 2016, a restructuring of the Carrières-sous-Poissy lines was implemented, resulting in the creation of line 1, the implementation of a new route on line 2, and the renaming of the old line 1 under the line 6. A new line linking the different districts of Carrières-sous-Poissy to the Peugeot factory of Poissy was created on the same date under the line 6P.

On January 6, 2017, the urban network of Poissy was modified, the line 53 ceased to exist and the line 50 were restructured due of his service to Peugeot factory of Poissy and renamed line 50P.

Development of lines operated by Transdev CSO

On January 10, 2011, the line 502 abandons its route between Saint-Quentin-en-Yvelines station and the Renault technocentre of Guyancourt, the route is transferred to new line 466 of the Sqybus network.

On January 4, 2016, the line 12 is limited between Vernouillet-Verneuil station and Cergy-Préfecture station, his school services were transferred to new line 13 between Verneuil-sur-Seine and Achères.^[5]

On September 3, 2018, the line 26 is restructured, his school services were transferred to new line 29.^[6]

Development of lines operated by Transdev Ecquevilly

Before the opening of the competition, the lines 2, 5, 12, 18, 19, 13, 21, 32 and 33 were operated by Transdev through their subsidiary Transdev Ecquevilly.

Development of Les Mureaux bus network

On September 1, 2007, the network of Les Mureaux consisted of five lines, their names were indicated with a color.^[7]

On September 1, 2008, the network is restructured with six lines (N1, 2, 3, 4, 5, 6) who commenced their services two weeks later with a partnership with Les Mureaux, the operator Veolia Transport and STIF.^[8]

The operating cost of the new network is €2.7 million per year, almost entirely covered by STIF, including €600,000 under its urban policy scheme, with the municipality of Les Mureaux contributing €100,000.^[9]

On September 1, 2014, following the opening of Pôle Molière in Les Mureaux. The lines 1, 4, 5 and 6 were restructured and a new line 7 was created.^[10]

First renaming

On May 9, 2023, the network is being restructured with a first renaming of all lines of the network:^[14][15][16]

Subsequent changes and integration of the lines operated by the Stile

On November 6, 2023, the line 50 was merged into the line 59.^[17]

On January 1, 2024, the three lines operated by the Stile were taken over by Keolis Seine et Oise Est and officially integrated into the network, the lines 44 and 100 has been merged into a unique line, Express 100.^[18][19]

On March 3, 2025, the lines 14 and 15 were restructured with new services, abandonning their circular services.^[20]

Second renaming

From August 25, 2025, the lines of Poissy – Les Mureaux were renamed, in accordance with the single regional numbering system planned by Île-de-France Mobilités in order to remove duplicated lines. The new lines will all begin with the prefix "65", followed by the last two digits of the old number, as soon as possible. For Express lines, the number will include the department number (in this case, Yvelines, therefore "78") and the last two digits of the line number.^[21]

The correspondence between old and new numbers is as follows:^[22]

Subsequent changes following the restructuring of the network

Following the restructuring of the network, some lines are modified:

• The line 33 is split into two separate lines:
  • The line 6533 between "Arquebuse" and "Maison des Associations", at Meulan-en-Yvelines
  • The line 6535 as a circular line of Meulan-en-Yvelines, serving Thun-le-Paradis station
• The line 61 is split into two separate lines:
  • The line 6561 between Vaux-sur-Seine and Les Mureaux (Lycée François Villon)
  • The line 6581 between Mézy-sur-Seine and Les Mureaux (Lycée François Villon)
• The line 63 is split into two separate lines:
  • The line 6550 between Vernouillet (Avenue de Triel) or Verneuil-sur-Seine (Hôtel de Ville) and Poissy (Institut Notre-Dame)
  • The line 6563 between Verneuil-sur-Seine (Allée des Clairières) and Poissy (Institut Notre-Dame)
• The line 67 is split into two separate lines:
  • The line 6567 between Gare des Mureaux and Saint-Germain-en-Laye (Nicot)
  • The line 6577 between Verneuil-sur-Seine (Allée des Clairières) and Saint-Germain-en-Laye (Allée Royale)
• The line 70 is split into two separate routes:
  • The line 6570 between Gare des Mureaux and Gare de Saint-Germain-en-Laye
  • The line 6582 between Morainvilliers and Chambourcy (Collège André Derain)
• The line 73 is split into two separate routes:
  • The line 6573 serving Ecquevilly (Collège Léonard de Vinci)
  • The line 6580 serving Les Mureaux (Lycée François Villon) and Aubergenville (Lycée Van Gogh)
• The lines 76a, 76b and 78c are modified:
  • The line 6576 (formerly 76a) between Menucourt (Pasteur) and Verneuil-sur-Seine (Notre-Dame Chemin Vert)
  • The liine 6578 (formerly 76b) between Vauréal (Les Valanchards) and Verneuil-sur-Seine (Notre-Dame Chemin Vert)
  • The line 6579 (formerly 76c) between Jouy-le-Moutier (Le Noyer) and Verneuil-sur-Seine (Notre-Dame Chemin Vert)

Later changes