There has been a large increase in the number of trains running late in the Thames Valley - with one in five not arriving on schedule.
Many thousands of First Great Western passengers endured frustrating journeys during August. Only 80 per cent of services were on time.
Now the company, which runs services from Paddington to Reading, Guildford, Basingstoke, Banbury and Swindon, will be forced to refund passengers. Our Transport Correspondent Mike Pearse reports.
Click here for an extended interview with First Great Western's Managing Director Mark Hopwood, in which he answers questions about delays, compensation and what is being done to solve the issues.