Rail services were disrupted today when hundreds of drivers from East Midlands Trains walked out in the first of six strikes planned for May.
The train company wants to cut the amount of money it pays into staff pension pots.
But members of the driver's union ASLEF claim it'll dramatically reduce the amount of money workers receive when they retire.
East Midlands Trains says it will aim to provide as many seats as possible for people travelling to the Olympic Games.
Communications have broken down between East Midlands Trains and ASLEF, as the union confirms train-drivers will strike during the Olympics
Train drivers are staging three days of strikes during the Olympics in a row over pensions.