First Great Western Managing Director Mark Hopwood explains in detail the changes to services and why the work is needed. He spoke to our Transport Correspondent Mike Pearse.
Stansted airport is expecting more than 220,000 passengers through the terminal over the Easter weekend.
This is some of the advice from Stansted:
- Check your flight status with your airline's website before you leave home
- Pack liquids, gels and pastes in hand luggage into a clear re-sealable plastic bag
- Check the latest security information on the airport website
- Arrive at the airport two hours before your flight's departure time
Around 600,000 passengers are expected to leave from Heathrow airport, 214,000 from Gatwick, 110,000 from Stansted and 55,000 from Luton this weekend, as cold Britons jet out for some sunny relief to the extended winter weather.
Journeys will be affected by the major building work at Reading while some travellers could be held up by work on the West Coast Main Line in the West Midlands. A strike at French ports has been called off though.
The Highways Agency has suspended road works over Easter on a number motorways and major roads but works remain on the M1 near Milton Keynes.
Stansted Airport expects over 220,000 passengers to pass through the terminal across the Easter bank holiday weekend as Brits head-off to sunnier climes and Europe's ski resorts.
It's the busiest part of the year so far at the Essex airport has people also head in from aboard.
Hundreds of thousands more air travellers will also take to the skies over the remainder of the week as new routes launch and many seasonal destinations return as the new summer flying schedule comes into operation.
Thousands of rail passengers are facing ten days of severe disruption as work to build a new £900m station at Reading reaches its most crucial stage.
Lines will close and passengers are warned journeys over Easter could take an hour and a half longer.
It means no direct services from places like Swindon, Oxford and Newbury to London. Trains from Bournemouth and Southampton to the north will also be badly hit.
When the project is complete it will increase capacity and ease delays at the most overcrowded and congested station on the network.
An army of workers will move in later tonight. So many will be on site that six thousand hotel rooms have been booked over the week to accommodate them.
The Waterloo & City line is suspended today, and the Circle, District, Hammersmith & City, Metropolitan and London Overground lines are all part suspended for engineering works.