Transport Secretary Mark Harper has announced a new trial scheme which will fluctuate the price of rail tickets based on demand.
As a result, the cost of travel services in some areas will be more or less expensive, depending on how many seats have been filled on a particular journey. The Department for Transport has said it hopes the changes will help better manage capacity and raise revenue at the same time.
A pay-as-you-go ticketing system will be implemented for train journeys across south-east England - it has not yet been confirmed if this trial will be expanded to other areas of the UK. Currently, an off-peak single journey between Durham and London costs just £1 less than a return.