Network Rail will have over 4,000 people delivering 150,000 hours and around £45m worth of improvements over the three days.

The biggest projects include:
* Further work to upgrade the West Coast mainline, enabling millions more people to use the railway each year and leading to a journey time reduction of 56 minutes from London to Glasgow
* Platform extensions at Luton Airport Parkway, helping create better journeys to London as part of the £5.5bn Thameslink Programme
* Track and signalling works at Merthyr and Newport, improving journeys for people across Wales and South West England
* Ongoing infrastructure improvement-work at Hull Docks. This will enable 20 extra freight trains to serve Humber Ports daily - taking up to 1,000 lorries off the roads every day

Details of the main concentrations of work are available on Network Rail's website at www.networkrail.co.uk/may