Three trains a day will be leaving Bedford and Flitwick stations slightly earlier over the next two months, as part of the autumn timetable.
First Capital Connect (FCC) has made the changes to combat the effect of slippery autumn leaves and affects the 0554, 0558 and 0614 from Bedford on Monday to Friday mornings.
The 0554 will now leave Bedford at 5.52am, Flitwick at 6.02am, Harpenden at 6.18am and St Albans at 6.24am.
The 0558 will now leave Bedford at 5.56am, Flitwick at 6.06am, Harlington at 6.10am and Leagrave at 6.15am.
And the 0614 will now leave Bedford at 6.12am, Flitwick at 6.22am, Harpenden at 6.38am and St Albans at 6.34am.
There will be no changes to arrival times at subsequent stations.
An FCC spokesman said: “Extending a couple of morning journey times by a few minutes will allow us to deliver a more consistent service through the autumn.”