Rail workers in England have voted to take part in three days of strikes later this month which could mean massive disruption to the network for passengers. There is no strike action planned in Wales but Glastonbury festival-goers and passengers trying to travel across the border face chaos.
And because Network Rail are involved in the strike action, it will inevitably affect services in Wales.
Members of the Rail, Maritime and Transport union (RMT) at Network Rail and 13 train operators will walk out on June 21, 23 and 25 , in the biggest outbreak of industrial action in the industry since 1989.
The RMT also announced another 24-hour strike on London Underground on June 21 in a separate row over jobs and pensions.
Read more stories about the rail network here
Rail staff in Wales at Transport for Wales were not involved in the ballot as there is no ongoing disputes with the Welsh Government, but the strikes threaten widespread travel disruption during a number of major events, including concerts, test match cricket and the Glastonbury festival.
Avanti, Cross Country and Great Wester Railway also run services in Wales and are affected, and Network Rail also controls the signalling.
The rail operators involved are:
Chiltern Railways
Cross Country Trains
Greater Anglia
LNER
East Midlands Railway
c2c
Great Western Railway
Northern Trains
Southeastern
South Western Railway
Transpennine Express
Avanti West Coast
West Midlands Trains
A spokesman for Transport for Wales said: "Transport for Wales is not in dispute with RMT. However, industrial action as a result of the dispute between RMT and Network Rail will disrupt our services, as we’ll be unable to operate our rail services on Network Rail infrastructure.
"We’re actively working through the detail of what this means for our customers to help them understand the impact. We’ll provide detailed information to customers via the TfW website as soon as this is finalised."
Glastonbury starts on June 22 , while that week will also see England play New Zealand in a test match in Leeds, the British athletics championships in Manchester, and gigs in London's Hyde Park by Sir Elton John ( June 24 ) and The Rolling Stones ( June 25 ).
There will also be a Commonwealth Heads of Government meeting in London on June 24 and 25 and it is Armed Forces Day on June 25.
Union members voted overwhelmingly for action last month in growing rows over pay and job losses. The RMT said rail staff who worked through the pandemic were facing pay freezes and hundreds of job cuts.
RMT general secretary Mick Lynch said: "Railway workers have been treated appallingly and despite our best efforts in negotiations, the rail industry with the support of the government has failed to take their concerns seriously.
"We have a cost-of-living crisis, and it is unacceptable for railway workers to either lose their jobs or face another year of a pay freeze when inflation is at 11.1% and rising.
"Our union will now embark on a sustained campaign of industrial action which will shut down the railway system."
Mr Lynch added that the union was "open to meaningful negotiations with rail bosses and ministers, but they will need to come up with new proposals to prevent months of disruption on our railways".
The union said more than 50,000 railway workers will walk out on June 21 , adding that the action will affect the national railway network for the entire week.
Andrew Haines, Network Rail's chief executive, said the organisation was "doing everything we can" to avoid the strike action.
"There are two weeks until the first strike is planned. We will use this time to keep talking to our unions and, through compromise and common sense on both sides, we hope to find a solution and avoid the damage that strike action would cause all involved," he said.
Transport Secretary Grant Shapps described the move as "incredibly disappointing".
"The pandemic has changed travel habits - with 25% fewer ticket sales and the taxpayer stepping in to keep the railways running at a cost of £16 billion, equivalent to £600 per household. We must act now to put the industry on a sustainable footing," he said.
"We are working with industry to reduce disruption caused by strike action, but unions are jumping the gun by announcing this when talks have only just begun."
Rail Delivery Group Chairman Steve Montgomery said the strikes were "needless and damaging".
Anthony Smith, chief executive of the watchdog Transport Focus, said: "It is crucial that all parties get back around the table and resolve this matter without bringing the railway to a standstill.
"It is passengers who suffer most in the event of strikes. Passengers will need plenty of advance information about the strikes and what services will be running to allow them to plan their journeys during this uncertain time."