Chelles - Gournay – Nanterre-La-Folie: which train is the most punctual?
Over 1 measured day (the observatory has been measuring since 3 November 2026), both ways: punctuality on arrival by departure time, the typical delay and the most reliable trains.
On time by departure time
Most reliable
The train ranking will appear once each train has run on at least 3 days in the period.
How we measure
A train counts as on time if it is less than 5 minutes late at its next station. Trains without live data are not counted.
The broad threshold, close to what most operators report: the share of tracked trains less than 15 minutes late.
Every minute, the state of each tracked train is recorded; the day is the average.
The comparison is with the average of the four previous same weekdays, as soon as two of them have been measured.
Delay counts on arrival at the final stop, once the train has arrived. Both directions are combined.
SNCF counts a TGV as on time when it arrives less than 5, 10 or 15 min late, depending on the journey length. Their figures therefore do not compare directly with ours.