Each set comprises two driving end cars (DM1 and DM2) and two intermediate cars (MDT and MT) They are capable of operation as two sets of their own class or in formations of up to 10 cars with either 2600 Class or 2800 Class DMUs. Each car is fitted with a 294 kW MAN traction engine and a Cummins generator engine, both mounted underfloor. Each 4-car set is long, high and wide. They have a maximum permitted speed of 120 km/h (75 mph). Passenger capacity is 185 seated and 634 standing.