 Combinations of two 3-car sets, three 3-car sets, two 4-car sets, a 3-car set + a 4-car set and two 5-car sets are possible.In case of emergency, they can operate in formations of up to 18 cars.In 2013, IÉ announced plans to reform the 22000 class units from 3 and 6-car sets into 3 and 4-car units, to obtain better flexibility from them in regards to passenger numbers per train.