Rail travelers will soon have fewer weekday peak time services between Watford Junction and London Euston.
West Midlands Trains are making changes to train timetables in order to accommodate other services elsewhere in the London Northwestern region.
West Midlands Trains operates both West Midlands Railway and London Northwestern Railway services.
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The twice-yearly changes to train times will come into effect from May 15, with some new services starting elsewhere in the region.
Most services are still running on the line but almost all journeys will experience some level of change to timings.
Head of stations for London Northwestern Railway Annamaria Izzard said: “I urge our customers to check ahead.
“All the new timetables are now in online journey planners meaning it is easy for passengers to check their routes and avoid being left behind.”
Routes between Bedford and Bletchley are among those which will benefit from the change with more trains availaible.
The new timetables are available to view at www.lnr.uk/timetables