GMB Class 71

Class 71
A Class 71 Airport Express Train at Oslo Central Station.
In service	1998–present
Manufacturer	Adtranz Strømmen
Refurbishment	2008–2009
Number built	16 units
Formation	3 cars (as built) 4 cars (from refurbishment 2008-2009)
Capacity	168 seats
Operator(s)	Airport Express Train
Line(s) served	Gardermoen Line
Specifications
Train length	82.3 m (270 ft 0 in)
Car length	27.9 m (91 ft 6 in) (ends) 26.32 m (86 ft 4 in) (centre)
Width	3,240 mm (10 ft 8 in)
Height	4,350 mm (14 ft 3 in)
Maximum speed	210 km/h (130 mph)
Weight	52 t (51 long tons; 57 short tons) (ends) 54 t (53 long tons; 60 short tons) (centre)
Power output	2,645 kW (3,547 hp)
Electric system(s)	15 kV  16 2⁄3 Hz AC Catenary
Current collection method	Pantograph
Track gauge	1,435 mm (4 ft 8 1⁄2 in)

GMB Class 71 is an electric multiple unit used by Flytoget for the Airport Express Trains on the Gardermoen Line of Norway. Sixteen three-car train sets were built by Adtranz Strømmen between 1997 and 1998. The units are capable of 210 km/h (130 mph), connecting Oslo Central Station and other stations in Metropolitan Oslo to the Oslo Airport, Gardermoen, along Norway's only high-speed railway.

In a three-car configuration, the units weigh 158 tonnes (156 long tons; 174 short tons) and are 82.3 metres (270 ft 0 in) long, with a power output of 2,645 kW (3,547 hp). The units are similar to the NSB Class 73, and are related to the Swedish X2 units. By 2009, all units were expanded with a fourth car.

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.