East Midlands Trains is taking legal action against a trade union, after members stopped doing overtime at the company.
Members of the Rail Maritime and Transport union banned overtime at the rail company, which caused disruptions to rail services, including cancellations and delays.
East Midlands Trains says the strikes are illegal, but the RMT union will challenge them in court.
More top news
Some showers, although many places will stay dry.
Mainly dry tonight. Showery rain spreading in tomorrow.
Team GB swimmer Adam Peaty, from Uttoxeter in Staffordshire, has broken the world record for the 50m breast stroke.