The viaduct of metro line 6, a famous symbol running through the Paris skies, is being refurbished. The structure, which was built over a century ago, stood the test of time remarkably well and weathered the colossal increase in traffic. A works programme was launched in 1997 to maintain and repair the infrastructure. The last step of the project covers waterproofing and painting works between Montparnasse – Bienvenüe and Trocadéro stations in summer 2021.
First step: deep cleaning
The tracks are fully removed to waterproof the viaduct again. In concrete terms, the 1,900 metres of metro tracks comprised of rails, roll ways, guide rails and sleepers are removed with the help of work machinery. The ballast is removed through “wells” in the vault and taken away by lorries.
Brick and metal work
Next step: renovating brick parts. The brick vaults damaged by water seepage are repaired. At the same time, rivets are replaced using hot riveting, and the path is refurbished. Its metallic parts contribute to making the sides of the tracks more secure.
Once the surface is clean, resin is applied to the brick and metal parts of the deck to waterproof them. The gutters network is refurbished to evacuate rainwater. Afterwards, a protective geotextile is laid before the ballast and the new tracks.
Step by step
The technical processes used mean that the waterproofing and painting steps must be separated, as all metallic arches are sandblasted in airtight containers. Anticorrosive paint is applied, followed by a coat of finish, whose grey shade is set by the City of Paris, over the entire viaduct.
The closure between Montparnasse – Bienvenüe and Trocadéro stations is the occasion to perform other maintenance operations, such as the refurbishment of the metal staircase at Dupleix station. Dupleix station will be fully closed until 27 August inclusive, and will then close every day at 10 p.m. from 28 August to 1 October inclusive. Trains will not stop at the station during this period.
Other works carried out during the summer include track renewal works between Trocadéro and Charles-de-Gaulle – Étoile stations.
Staff members are mobilised daily to inform and guide you during the works period. Replacement buses services and temporary stops are available along metro line 6’s route for easier journeys. Bus routes 22 and 30 will run more frequently during the period (metro line 6 map available here).
You can also visit our social media, notably metro line 6’s Twitter account.