In the 30 months since the Elizabeth Line opened – years late and billions over budget – the east-west line through London has become the most important piece of transport infrastructure in the UK.
Britain’s three busiest rail stations are all on the Elizabeth Line.
But after two days of chaos due to a botched software upgrade, which caused the cancellation of hundreds of trains, commuters face a further month of disruption.
The RMT union has announced industrial action by “control room grade members” working for the Elizabeth Line after rejecting the company’s latest pay offer.
The union is seeking improvements to holiday entitlement and reduced working hours.
A two-week overtime ban begins on Thursday 5 December.
From the final trains on Christmas Eve to 30 December, no trains will run west from London Paddington due to work on the HS2 project at Old Oak Common.
The following day RMT members will resume industrial action with a 24-hour strike beginning at 9pm on 31 December. The aim is to disrupt New Year’s Eve celebrations in central London.
The RMT’s general secretary, Mick Lynch, said: “Our members play a vital role in running the Elizabeth Line and their demands for fair treatment on working hours and leave remain unmet.
“The current offer falls short, and our members are determined to secure a fair deal.”
The union has called for talks with Elizabeth Line management.
A TfL spokesperson said: “If this action goes ahead we expect the Elizabeth line to operate normally, but would ask customers to check before they travel.”
If the action goes ahead, many December journeys could be hit – for those travelling in central London, as well as Berkshire and Essex.
While GWR and Greater Anglia trains also serve some Elizabeth Line stations, many of the stops are now Elizabeth Line-only.
The Central Line of the London Underground provides an alternative to the Elizabeth Line between east and west London, but has smaller capacity.
The latest performance figures for the line, from April 2023 to 31 March 2024, show that one in eight trains
Online, the Elizabeth Line management, says: “Our customers and users expect a safe and reliable transport network and we put customers at the heart of everything we do.”