Rail authorities say they have "learned the lessons" of last year's chaos as they prepare to roll out more timetable changes.

More train timetable adjustments are set to come into force on May 19 as more than 1,000 extra services are added in a bid to tackle overcrowding.

It comes a year after passengers faced chaos when the introduction of new schedules crippled large parts of the network in the north and south-east of England.

The Rail Delivery Group said it had "learned the lessons" from last year's disruption and that new services were only being introduced where there was "high confidence" infrastructure, staffing plans and trains would be ready.

Paul Plummer, Chief executive of the body, said: "The scale of our ambition to improve means that this is a significant challenge and while there may be some teething problems, train operators and Network Rail have worked together to carefully assess where new services can be introduced without impacting reliability.

"Many parts of the country are set to benefit this summer from a better service, but where introducing improvements puts reliability at risk, we are rightly taking a more cautious approach."