The unit is based on the Swedish X2 designed by Kalmar Verkstad in the 1980s, and delivered from 1990 to the Swedish State Railways for use in their X 2000 high-speed intercity trains. Although the technology involved is similar, like spot-welded stainless steel car bodies, the Class 71 differs in several ways. First, the unit does not have a separate locomotive unit, but has the motors spread throughout the train, with one powered and one unpowered bogie in each car. The car bodies are totally different in layout, including the doors between bogies instead of at the end of the cars. In addition, the trains are pressure tight to increase comfort for passengers while passing through tunnels. They also have hydraulic couplers at the ends, which are hidden behind covers when not used. The Class 71 is also shorter, with only three cars, and does not have any tilting technology installed. The exterior design, especially the nose, is quite different. Norges Statsbaner later took order of 22 units of the Class 73, that is almost identical, but has four cars and tilting technology. Class 73's pantograph is pivoted in order to keep it centred under the catenary when the body tilts.