Network Rail has released a map that shows the scale of the rail strike chaos that is set to hit the country this week.
Members of the Rail, Maritime and Transport (RMT) union at Network Rail (NR) and 13 train operators are to strike on Tuesday, Thursday and Sunday.
The RMT and Unite are also striking on London Underground on Tuesday, in a separate row over jobs and pay.
Services across the UK will start to be affected from Monday evening, with just one in five trains running on strike days, mainly on main lines and only for about 11 hours.
A map for passengers to show where trains won't be running has now been released by NR to aid passengers in planning for journeys.
You can to the full map and see more information at Network Rail.
Here is more information about the strikes (correct as of Monday afternoon):
How bad will the disruption be?
Fewer than one in five trains will run, and only on main lines and only for around 11 hours, starting later and finishing earlier.
Will there be strikes on the London Underground?
Yes. Members of the RMT and Unite will strike on Tuesday.
Are other unions involved in the dispute?
Yes. The Transport Salaried Staffs Association and the drivers union Aslef are also taking industrial action or balloting for strikes.
What are the strikes about?
The railways are proposing to make efficiency savings, especially as fewer passengers are travelling by train because of the pandemic, which has led to more people working from home.
Watch: UK rail strikes: What are the reasons behind the walk-out?
Why hasn't the government been involved in the negotiations?
Transport secretary Grant Shapps said it is up to the unions and employers to negotiate pay and conditions, but Labour and the unions believe he should be taking part in the talks.
What are the efficiency savings the industry wants?
They largely revolve around the use of new technology, such as drones to check on railway tracks rather than having workers walk along lines.
How many jobs are likely to be lost?
Unions believe between 2,000 and 2,500 jobs are at risk.
Are the union leaders driving the strikes?
Thousands of RMT members voted overwhelmingly in favour of strikes, while similar outcomes are expected among TSSA and Aslef members currently being balloted.
Has a pay offer been made and what are the unions asking for?
Offers of around 2.5% have been made during talks with Network Rail, although nothing has been formally tabled by the train operators.
The unions point to the 11% rate of RPI inflation, although they have not formally put a figure on their demands.