ASLEF has decided to call off its strikes for three days in August against East Midlands Trains.
Previously, it was believed a number of services between August 6-8 would need to be cancelled, with a limited service to London for the Olympics.
EMT believes ASLEF called off its strike due to reaching an agreement over pension contributions.
A joint statement from the two groups said: “Following further constructive discussions today, East Midlands Trains and ASLEF are pleased to confirm that a positive settlement of all issues relating to planned pensions changes has been reached.”
Local members of ASLEF had previously held strikes on various days throughout May after EMT declared changes to their pension contributions.
The train company, run by Stagecoach Group, decided to reduce yearly payments by £500.
ASLEF argued this would make a saving in the short term, but would lead to less money available when workers retired.