Delays of up to 40 minutes on London Midland trains between London Euston and Tring, and between London Euston and Milton Keynes Central, and also on Virgin Trains between London Euston and Milton Keynes due to broken down train at Berkhamsted.
Disruption on London Midland trains between Birmingham New Street and Northampton due to a vehicle hitting a bridge between Birmingham International and Coventry.
Replacement bus service running on London Midland between Bedford and Bletchley due to broken down train.
London Midland which operates trains through Northampton and Milton Keynes says nearly 4,500 extra seats will be available for commuters by 2014.
The company says more trains will be run in peak hours by increasing their maxiumum speed from 100 miles per hour to 110.
Journey times bewteen London and Northampton will drop by ten minutes and from Milton Keynes to the capital by seven minutes. It's one of the most intensively used lines in Europe.