Poissy – Les Mureaux is a French bus network run by Île-de-France Mobilités and Grand Paris Seine et Oise, operated by Keolis through his subsidiary Keolis Seine et Oise Est from August 1, 2021.
It consists of 81 lines serving the bassins of Poissy and Les Mureaux. The network is also completed with four night lines, a demand-responsive transport and the Noctilien line N155.
History The first lines appeared during the 1950s with different names of previous networks Poissy Aval, Deux Rives de Seine, Les Mureaux et Val de Seine.
Network development 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.
On September 3, 2018, the line 26 is restructured, his school services were transferred to new line 29.
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.
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.
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.
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.
Opening to the competition Due to the opening to the compeititon of public transport in Île-de-France, Poissy – Les Mureaux was founded on August 1, 2021, corresponding to public service delegation number 14 established by Île-de-France Mobilités. A call for tenders was therefore launched by the organizing authority to designate a company that will operate the network for a period of eight years. It was finally Keolis who gain the operation, through his subsidiary Keolis Seine et Oise Est, which was designated during the board of directors on February 11, 2021.
At the time of its opening to the competition, the network consisted of the lines shown in the table below:
+List of the lines of Poissy – Les Mureaux Oldest network Lines Autocars Tourneux 1, 2, 3, 12, 22, 26, 29, 30, 31, 32, 33, 35, 37, 39, 502 N1, 2, 3, 4, 5, 6, 7 30–27 A14 Verneuil, A14 Mureaux, 100 Transdev CSO 1, 2, 6, 9, 10, 11, 14, 16, 20, 21, 24, 25, 28, 50, 51, 52, 54, 98 Transdev Ecquevilly 2, 5, 12, 18, 19, 13, 21, 32, 33
On August 1, 2021, the line 18 was restructured in three new lines:
The line 18 between Les Mureaux and Aubergenville The line 28 between Les Mureaux, Maule and Villiers-Saint-Frédéric The line 38 between Aubergenville, Maule and Andelu
On August 16, 2022, following its summer service interruption, the line 21 (Aubergenville-Poissy) is restructured in two new lines, 21a and 21b.
On January 2, 2023, a new stop is created to serve the medicalized care home of Bécheville.
First renaming On May 9, 2023, the network is being restructured with a first renaming of all lines of the network: +Network renaming Old New 2P24 1 10255152 2 50 3 N17M 4 5152 5 2M5M7M 6 3M6M 7 98 10 13HE 11 20 12 30 13 313237 1415 32V33VM 16 35 17 39 18 11 19 16 20 2MC 21 5SM 22 18 23 54 24 32M 25 33M 26 1V 27 2VM 28 25 29 1CP 30 6CP 31 28 32 32MY 33 55 34 11 40 12VC 41 3MSG 42 26 43 502 44 24S 50 2CS (school services) 51 10 (school services) 52 25 (school services) 53 50A 54 50B 55 52A 56 50B 57 7 (school services) 58 14 59 311 60 312 61 313 62 29 63 98S 64 3S1 65 3S2 66 26 (school services) 676869 21 70 22 71 13VC 72 12AM 73 11 (school services) 74 32V 75 30-27 76 50P 90 14P 91 26P 92 21A 93 6P 94 21B 95 Express 9 X409 Express 19 X419 100Express A14Soirée Unchanged
Subsequent changes and integration of the lines operated by the Stile On November 6, 2023, the line 50 was merged into the line 59.
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.
On March 3, 2025, the lines 14 and 15 were restructured with new services, abandonning their circular services.
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.
The correspondence between old and new numbers is as follows:
+Network renaming Old New 1 2 3 4 5 6 7 10 11 12 13 14 15 30 20 18 19 21 22 23 16 25 26 27 28 29 31 32 33 34 24 17 40 41 42 43 63 51 52 53 54 55 56 57 58 59 60 61 62 64 65 66 67 68 69 70 71 72 73 74 75 76a 76b 76c 90 91 92 93 94 95 100 X409 X419 A14 Les Mureaux A14 Verneuil
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 2026 In July 2026, a new line 6538 is created to serve the Île de Loisirs du Val-de-Seine in Verneuil-sur-Seine from Gare des Clairières de Verneuil. However, this line is only running during the summer break.
Routes Main routes