Thousands of rail workers will stage three days of strikes later this month in the largest bout of industrial action since 1989.
The RMT union announced plans for nationwide train strikes at Network Rail and 13 other operators on June 21, 23 and 25 following a dispute over pay.
In fresh travel chaos, there will also be a 24-hour strike on London Underground on June 21 in a separate row over jobs and pensions.