East Midlands Trains has called ASLEF bosses hypocrites after the union called two further days of strike action over pension scheme changes.
The union said it plans to strike on Saturday June 23 and Monday June 25, affecting trains from Kettering and Wellingborough.
David Horne, managing director of East Midlands Trains, said: “We know that our passengers will be extremely angry to hear that the ASLEF union is planning to cause further unnecessary disruption to their train services.
“Both the RMT and Unite unions have recommended acceptance of the same updated pensions proposals we offered to ASLEF several weeks ago.
“ASLEF also accepted the same pension contribution changes at two other rail companies. The action being taken by ASLEF is indefensible and pure hypocrisy.
“Everyone wants ASLEF to put the interests of its members and passengers first by sitting down with us to resolve this dispute.”
Mr Horne added: “We have already demonstrated that we can successfully continue running services for passengers despite ASLEF’s action and we are committed to running as many services as possible on 23 and 25 June.”