Birmingham rail passengers will be hit with festive season disruption for the second year running to allow £9.5 million worth of new track to be laid at New Street Station.
Network Rail will begin nine days of essential engineering work on Christmas Day to replace the current 40-year-old rails in the eastern half of the station - platforms 7a to 12.
Network Rail said its workers would ensure the renewal was completed for the return to work on January 3.
Peter Strachan, from Network Rail, said: "A great deal of forward planning has gone into this renewal programme, building on the success of part one of this project undertaken last year.
"We've been working with our colleagues to provide as normal a service as possible for passengers using the station over the festive period.
"Christmas is traditionally a quieter time for the railway with fewer passengers travelling.
"This major investment will make the track more reliable, providing a better service for passengers who use New Street Station".
Apart from Christmas Day and Boxing Day, the station will remain open while work is carried out.
Where train services are affected, Central Trains will run bus replacements for local services and services to London will have slightly extended journey times.
Last year, platforms 1 to 7b were upgraded in the same way and retailers, such as the Bullring, were told the renewals would happen over two festive seasons in order to keep part of the station operating as normal
Meanwhile, engineers are due to finish work on a new stretch of track at Birmingham International, which will come into service on December 27.
Once complete, this will increase capacity between Birmingham and Coventry.
As a result, the line will be closed on Christmas Eve.
Virgin and Central trains will operate replacement bus services.
A spokesman for NR said: "Passengers travelling over the Christmas period are advised to allow plenty of time for their journeys and check before travelling with National Rail Enquiries on 08457 48 49 50.
"Details of alternative travel arrangements will also be made available at local stations across the region."