Powered by a 285hp Cummins NT855-R5 Diesel, working through a Voith Hydraulic transmission, the maximum speed of a Class 153 is 75 mph, making it perfectly suited for small cross-country services. They are fitted with standard BSI auto-couplers, allowing them to work in tandem with other multiple units from the 14X and 15X Classes fitted with the same coupler, as well as newer units like the Class 170. In 2019/2020, five former GWR 153s moved from Northern to Abellio ScotRail for use on the West Highland Line attached to Class 156s as 'active travel' carriages. These units have had their interiors heavily modified to carry up to 20 bicycles, along with large bags and sports equipment.