One in seven trains missed the industry's Public Performance Measure (PPM) of punctuality in the 12 months to August 18.
Pay and disputes over guards will threaten services over the summer
New lines and improved connections between cities could reduce reliance on London according to a new report
Every train run by the UK's busiest franchise, Govia Thameslink Railway (GTR) was rescheduled from Sunday.
The shake-up is designed to increase overall frequencies and reliability, but some passengers will find their regular journeys are no longer possible.
Christian Wolmar said that, while the RMT should come to an agreement, the Government must be prepared to negotiate