Commuters across the South and South East will have to pay higher train fares from today.
Research done by the Campaign for Better Transport shows many season tickets prices have risen by more than 50% in the last 10 years.
The average fare increase is nearly 4% up on this time last year.
Meanwhile commuters using the Chiltern railway will be charged more to park their cars at train stations in Oxfordshire and Buckinghamshire from today.
Wendover, Princes Risborough, Haddenham and Thame, Bicester North and Banbury are among those affected.