Marne et Seine bus network

Marne et Seine bus network is a public bus transport network operating in the Île-de-France region, organized by the organizing authority Île-de-France Mobilités. It has been operated by the Transdev group through the company Transdev Coteaux de la Marne since August 1, 2023. The network operator will also operates the future Câble 1.

Marne et Seine bus network
A Heuliez GX 337 on school route 444.
Overview
Owner	Île-de-France Mobilités
Area served	Seine-et-Marne: Férolles-Attilly, Pontault-Combault, Servon Essonne: Brunoy, Crosne, Yerres Val-de-Marne: Boissy-Saint-Léger, Bonneuil-sur-Marne, Champigny-sur-Marne, Chennevières-sur-Marne, Créteil, Limeil-Brévannes, Maisons-Alfort, Marolles-en-Brie, Noiseau, Ormesson-sur-Marne, La Queue-en-Brie, Saint-Maur-des-Fossés, Santeny, Sucy-en-Brie, Valenton, Villecresnes, Villeneuve-Saint-Georges.
Line number	26
Website	Official website
Operation
Began operation	August 1, 2023
Operator(s)	Transdev (Transdev Coteaux de la Marne)

The network consists of 26 routes, including nine school routes and one express route.

On April 8, 2024, the network will follow the new regional numbering of bus lines and will take the numbers 427 to 451.

History

Network development

Competition opening

Due to the opening up of public transport to competition in Île-de-France, the Marne et Seine bus network will be created on 1 August 2023, corresponding to public service delegation number 21 established by Île-de-France Mobilités. A call for tenders was therefore launched by the organizing authority in order to designate a company that will operate the network for a period of eight years. It was finally Transdev, via its subsidiary Transdev Coteaux de la Marne, which was designated during the board of directors of December 7, 2022.

The network consisted of SITUS ex-routes 2, 7, 8, 10, 21, 22, 41, 42, 51, 71, 81 and 82 while operated by CEA Transports, lines 1, 3, 4, 5, 6, 9 of SITUS and route 12 of Arlequin operated by Transdev SETRA, plus the routes B, J1, J2, K, O1, O2 and U of Transdev STRAV.

On January 1, 2024 and following the end of the outgoing contract, the Express 100 Torcy-Créteil route is taken over by Transdev Coteaux de la Marne.

Routes renaming

As of April 8, 2024, the Marne et Seine network will apply the new single regional numbering principle planned by Île-de-France Mobilités, removing duplicates and letters. The correspondence between old and new numbers is as follows: lines J1 and J2 merge into a single line 427 and lines 429 and 430 get new routes. :

Network renaming

Old route	New route
J1+J2	427
K	428
O1	429
O2	430
1	431
2	432
3	433
4	434
5	435
6	436
7	437
8	438
9	439
10	440
21	441
22	442
41	443
42	444
51	445
71	446
81	447
82	448
U	449
B	450
12	451

Routes

Marne et Seine

Image	Bus	Between	And
	427	Boissy-Saint-Léger RER	Villeneuve-Saint-Georges — Les Graviers
	428	Villeneuve-Saint-Georges RER	Créteil — Préfecture
	429	Créteil–L'Échat	Limeil-Brévannes — Emile Combes - Descartes
	430	Boissy-Saint-Léger RER	Créteil–L'Échat
	431	Sucy–Bonneuil RER	École des Bruyères
	432		Mairie de Noiseau Émerainville - Pontault-Combault RER
	433		Noiseau – Claude Monet
	434		Sucy-en-Brie – Les Monrois Lycée de Sucy
	435		Boissy-Saint-Léger RER
	436	Les Boullereaux-Champigny RER
	437	Champigny - Saint-Maur RER	Pontault-Combault – Centre Commercial Les 4 Chênes
	438	La Varenne–Chennevières RER	Chennevières-sur-Marne – Centre Commercial Pince Vent
	439	Sucy–Bonneuil RER (circular line)
	440	Sucy–Bonneuil RER	Chennevières-sur-Marne – Centre Commercial Pince Vent
	441		Sucy-en-Brie – Collège du Fort
	442	Noiseau – La Garenne	Sucy-en-Brie – Collège du Parc/Parc de Sucy
	443	Sucy–Bonneuil RER	Sucy-en-Brie – Collège du Fort
	444	Sucy-en-Brie – Les Berges
	445	Boissy-Saint-Léger RER	Groupe scolaire Amédée Dunois
	446	La Queue-en-Brie — Petit Caporal	Chennevières-sur-Marne — Lycée Champlain
	447	Chennevières-sur-Marne — Moulin Vert	Collège Molière
	448		Lycée Champlain
	449	Villecresnes (circular route)
	450	Créteil–L'Échat	Yerres — Abbaye/Cimetière Brunoy RER
	451	Créteil-Préfecture Boissy-Saint-Léger RER	Servon — Centre commercial Eden

100 Torcy-Créteil

Image	Bus	Between	And
	100 Torcy-Créteil	Torcy RER	Créteil–L'Échat