Hundreds of thousands of rail passengers using South West Trains face massive disruption over the Christmas and New Year holidays.
An army of workers will move in to work on Reading's rails - 6, 000 hotel rooms have been booked over the week to accommodate them.
The cold weather meant more misery for rail travellers today with serious disruption on a number of key commuter routes.
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.
Part of the station will remain closed for another week causing further disruption. Reading is the busiest station outside London and buses will replace some trains with others diverted.
Hundreds of thousands of rail passengers will face major disruption with a complete closure of the lines through Reading from tonight until next Tuesday. It will allow for the completion of the first stage of the £900 million upgrade of the station.
Railway lines through Reading are closing today until Tuesday. It's to allow completion of the first stage of the £900m upgrade of the station. Buses will replace some trains, with others diverted. The station is the busiest outside London.
Disruption on South West Trains between Hampton Court and London Waterloo, between Exeter St Davids and London Waterloo and between Epsom and Dorking due to speed restrictions following a problem on the track between Raynes Park and Wimbledon.
Hampton Court services start/terminate at Surbiton. Exeter/Salisbury services are start/terminating at Basingstoke. Epsom to Dorking trains may be cancelled. Other services up to 20 minute delays. London Underground accepting tickets.
The cold weather meant more misery for the region's rail travellers today. A build up of ice on the lines caused serious disruption on a number of key routes during this morning's rush hour.
Services were suspended between Havant and Guildford and Alton and Farnham, while there were major delays between Reading and London Waterloo and also at Southampton and Portsmouth. Divya Kohli has our report.
We have been treating the third rail in the south of England with anti-icing solution and trains were running around the network overnight to keep the rails clear of ice as much as possible.
Additional people were used on the ground to respond to incidents and carry out regular inspections of the infrastructure.
We will continue to work closely with train operators throughout today to deliver the best possible level of service and apologise for any disruption caused to passengers.
For the latest information, passengers should check with National Rail Enquiries or their train operator before travelling.
The scene in Alton this morning after a series of rail delays has left commuters stranded. Many say they've now decided to work from home.
Delays between #Havant and Guildford expected until 14:00
#Alton - This is still no service between Alton and Farnham, the ice has cleared but a further electrical supply problem has developed.