East Midlands Trains has lost its High Court application for an injunction against the Rail Maritime and Transport Union.
The rail company took the legal action after hundreds of the union's members banned overtime, claiming a breakdown of relations between the two parties.
East Midlands Trains had said the dispute was "invented".
A judgment is expected today following legal action taken by East Midlands Trains against a trade union over a dispute it claimed had been 'invented'.
Members of the Rail Maritime and Transport union (RMT) banned overtime earlier this month over claims of a breakdown in industrial relations over a number of issues, including the scheduling of work in Nottingham.
The union said the action had led to timetable changes and cancellations over the weekend, but the company maintained they were due to driver shortages.
The case was heard in the High Court yesterday, with judgment reserved until today
The Rail Maritime and Transport union says it will fight the legal action brought against it by East Midlands Trains.
The rail company is taking the union to court after members stopped doing overtime.
RMT are determined to defend the union's position on this matter.
Our demands are not unreasonable and we firmly believe that management should sit down and enter into meaningful negotiation with RMT, instead of hiding behind the anti-trade union laws in an attempt to prevent the union from taking industrial action.
East Midlands Trains is taking the Rail Maritime and Transport union to court after members were banned from doing overtime with the company.
The union said there had been a dispute over a number of issues, including the scheduling of work.
We have been forced to start legal proceedings to prevent the RMT from trying to cause disruption to our passengers by encouraging and misleading our employees into taking unlawful strike action.
This is an invented dispute and there is no substance to the allegations made by the union.
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.
Neil Micklethwaite, East Midlands Trains Customer Service and Commercial Director, has told ITV News Central Nottingham Station will stay open during the £100 million signalling upgrade.
A £100m rail upgrade across Nottinghamshire will cause disruption across the East Midlands this summer - to find out how click here.Read the full story ›
Speaking about today's timetable changes during the signalling upgrade work this summer, the Managing Director of East Midlands Trains said:
"Every effort has been made to deliver the best possible service forour passengers during Network Rail's re-signalling works whilstrecognising that some people will face considerable changes to their normal journey.
"We have invested around three years of careful planning to ensure we can keep people on the move throughout the work at Nottingham.
"Our advice for passengers is to be prepared and check in advance of travel at [eastmidlandstrains.co.uk/
Commuters in Nottingham will find out how much they'll be affected by a £100 million project to upgrade railway signals in the county.
Major disruption is expected throughout July and August when the redevelopment work is taking place.
New timetables are being published today which explain which services will have to change during the construction work, with some trains being cancelled altogether.
Thousands of passengers travelling on East Midlands Trains are likely to face severe delays until the end of the week because of extensive damage to overhead power cables.
A one kilometre section of overhead line is down at Radlett in Hertfordshire.
Delays to and from London could be up to an hour.
For more information see the East Midlands Trains website.