France's national rail company SNCF said that trains should be running normally on Monday after the previous day's disruptions.
But that's unlikely to be a source of much comfort to passengers who were left disappointed at the packed out station in the French capital's 15th arrondissement on Sunday.
The SNCF had announced that a "computer bug" had led to signal failure and that all services including TGV, TER, Transilien and Intercités trains would be cancelled from 1pm on Sunday.
"This new incident is unacceptable," said the Minister of Transport, Elisabeth Borne, on Sunday night.
SNCF explained that it was setting up "a new signalling system to increase the number of trains leaving the station by 20 percent".
"This operation went well until noon," said SNCF manager Didier Bense.
Naturally, passengers took to social media to vent their frustration.
One wrote: "Gérard the technician at Montparnasse station wishes you a rubbish Sunday!" (see below).
Another wrote: "Monstrous breakdown at Gare Montparnasse tonight. It's better in the south: In Aix, trains are only one or two hours late."
Panne monstrueuse ce soir à la Gare Montparnasse. C'est mieux dans le Sud: à Aix les trains ont seulement entre 1 et 2 heures de retard!— bernard pivot (@bernardpivot1) December 3, 2017
Another tweeted: "Parisians right now after the breakdown at Montparnasse station" (see below).
And some were even doubtful that service had been returned to normal on Monday morning.
One Twitter user wrote: "A return to normal according to the SNCF" (see below).
This isn't the first time this year that the station has been the source of travel woes.