France’s transport minister said human error did not cause a train derailment outside Paris that left six dead.
Frederic Cuvillier said that around 30 people were still considered injured.
In all, nearly 200 people sustained injuries in the initial accident, when four train cars slid toward the station, some falling over.
The Friday night crash was France’s deadliest in years, but Mr Cuvillier said it could have been worse and praised the driver who sent out an alert quickly, preventing a pile up.
Mr Cuvillier said it was unclear what did cause the accident, but authorities are looking into an error in the switching system as well as other possibilities.
This is one of the busiest travel weekends in France, which is celebrating the national holiday of Bastille Day on Sunday.