Chiltern Railways is the most punctual English commuter and long distance rail operator, according to Network Rail figures.
The findings, based on the percentage of services arriving within a minute of their scheduled time, revealed 84.7% of Chiltern trains over the last year were on time.
This compares to an average of 65.7% London Midland services and 54.1% of Virgin trains arriving on time. The national average was 69.2%.
Chiltern Railways Director Thomas Ableman said: “Passengers always tell us that punctuality is their top priority.
“The Chiltern team put a huge amount of effort into ensuring that trains run precisely to time and these results come as no surprise to us. In part it is because passengers know they can rely on Chiltern trains that so many people are switching to Chiltern every day.”