Summer is here and the Parisians, as usual, are set to carry out their annual exodus for les vacances.
And with a 30-percent dip in the usage of public transport in the capital, Paris transport chiefs will be taking advantage to carry out a series of upgrades and maintenance works on the aging lines.
The head of the Transilien network, Alain Krakovitch, said the renovations were "good news", because 30 percent of the problems with the trains come from aging infrastructure.
"Of course, there will be headaches and difficulties for travellers on the lines, they're going to need to be ready to deal with changes and complications each day," he told Le Parisien newspaper.
While the Metro lines that won't be getting a face lift will be bolstered to help carry commuters and tourists to their destinations, there's no doubt many will be affected by the changes.
Which lines will be affected?
The public transport operator RATP has said that one of the biggest summer renovation projects will be on the RER A commuter line between La Défense and Nation - which will be closed down between July 23rd and August 21st (inclusive).
These stations are dotted across the heart of Paris on a line that has been ranked the busiest in Europe with 1.2 million passengers a day.
Even though passengers have been advised not to rush to the parallel-running Line 1 on the Metro, expect crowds there anyway.
The works are part of a multi-year renovation work that started in 2015 and that will see workers on the site 24 hours a day, seven days a week. The video below shows some infographics about what's actually going on beneath the city.
The RER C line will be closed between July 16th and August 27th between the stations of Austerlitz and Javel, and also from Austerlitz to Avenue Henri-Martin.
The Transilien Line N will see closures between Montparnasse and Dreux from July 4th to August 28th as they replace 55 kilometres of tracks.
Metro Lines 1, 4, and 6 will see interruptions too. Line 1 will be closed between La Défense and Porte Maillot from July 14th to 17th. The Quai de la Gare station on Line 6 will be closed between June 13th and August 28th, and Line four will see occasional closures of some stations that will be advertised in advance.
Tramway line T2 has been closed until July 15th between Parc de Saint-Cloud and Les Moulineaux.