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Transports: Up to 27 extra trains cancelled on this commuter rail line every day when school starts!

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The Editor

Adding to this back-to-school rush comes some unwelcome news for regular RER D commuters: the line will operate with reduced service for several months starting in September. From Monday, August 24th onwards, 27 trains will be removed from circulation each day for the first four weeks, followed by additional adjustments. Just what thousands of Île-de-France commuters needed to make their daily journeys even more complicated!

After several summer weeks already marked by construction work and disruptions, RER D users are not out of the woods yet. As the back-to-school season approaches, this Île-de-France line will have to manage with a reduced transport offer, with several trains canceled each day. A situation that risks complicating journeys for thousands of passengers from the end of August onwards.

27 trains canceled from late August

The reduction in service affects the two main southern branches of RER D. 12 trains are canceled on the Melun branch and 15 on the Corbeil-Essonnes branch, totaling 27 fewer trains each day. This new schedule is set to continue until the end of 2026.

This reduction in service can be explained by two factors: the construction of new maintenance workshops in Joncherolles and Villeneuve-Saint-Georges, which limit maintenance capacity, but also the heat waves of recent months, which have particularly affected the older Z2N trains. Transilien indicates that this reduction in the number of trains is necessary to keep the fleet in working order.

A situation that won't stop in September

While the 27 cancellations concern the first four weeks starting August 24th, the transport schedule may then change. The cancelled trains won't necessarily be the same from week to week, Transilien clarifies. The week of September 21st will be particularly notable as work will once again modify the transport schedule. Passengers will therefore need to check

check their schedules before taking RER D, especially during peak hours.

This reduction in service comes as the line is already at the heart of a vast modernization program. The deployment of new NG RER trains is continuing gradually on line D: since June 2026, these new trains operate an average of 55 trains per day. They are gradually replacing the older Z2N trains.

Construction work on top of service cuts

Added to this frequency reduction are the numerous construction projects scheduled on RER D at the end of the year! Some are causing circulation interruptions, particularly in the evenings. The modernization of the network should ultimately improve the regularity and performance of the line, but it's causing significant disruptions during construction work.

For passengers, the reflex will be to check real-time schedules before each journey, particularly during the first weeks of September. Transilien also recommends using the route planners in the Île-de-France Mobilités or SNCF Connect apps to identify any possible alternatives.

A back-to-school season that's bound to be particularly eventful for RER D users… and should remind many people why it's always better to check your route before you leave! Hang in there.