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.
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Ahead of the conference, calls are growing for Midlands regions to have their own devolved powers to match those on offer to Scotland.
After a cool start, Sunday looks set to be a dry and bright day, with sunny spells.
Mainly dry with clear spells but possibly one or two light showers near coasts overnight, remaining largely dry on Sunday.