Network Rail said that only 20% of trains will run, with operators such as LNER and cross-country affected.
It appeared after the rail strikes throughout England on Thursday and strikes at the London Tube Network on Friday.
Mick Lynch from RMT Union said more “very possible” industrial actions.
Speaking to Breakfast, Mr. Lynch refused advice that a striking train worker would approve the current offer on the table if the union submitted it.
He added: “I will speak with senior executives in the industry throughout the next week trying to create solutions to this problem and then we will decide whether we need to take more industrial actions – but I have to say that it is very possible to provide gaps between us today. “
Which Rail is still running?
Only about one in five trains will run on Saturday, with some areas do not have services throughout the day.
The line will only be opened from around 07:30 BST until 18:30 for the limited service that is running – on what is now the sixth day of the national train attack this summer.
In London, the bus strike will continue on Friday, with a very affected route in the southwest of London and part of Surrey.
Scotrail said the dispute did not involve its staff, but there might be a beat effect in Scotland because there will only be 11 open routes.
Because train attacks often leave trains in the wrong part of the country at the beginning of the next working day, Sunday travelers have been warned to expect some disturbances – although 85% of services are expected to run as usual.
Today’s big music program that attracts thousands of fans traveling will include Becky Hill at Crystal Palace Park in London and All Point’s East Festival, at Victoria Park, London. Camp Bestival took place in Shropshire but it was estimated that most of the 90,000 ticket holders were already in a location in the middle of the four-day festival.
And of course, every Saturday during the soccer season see the mass migration of away fans.