Specifications
The Gullfisk were built as self-contained aluminum riveted bodies. This gave a light body that was strong as steel, giving what at the time was regarded as a more elastic structure which would not break as easy. However, this resulted in the bodies sinking somewhat at the ends and between the bogies. It also caused more deformation during accidents, increasing the costs of repairs. The bodies were 15.40 meters (50 ft 6 in) long and 2.50 meters (8 ft 2 in) wide. The center beam between the two bogies was made of steel, and was intended to compensate for the soft aluminum structure; these were prone to rust and needed repeated replacement. The bodies had a very streamlined shape and a distinct tail, that in addition to the aesthetic purpose was chosen because it strengthened the structure. During prototyping, the vehicle was tested in a wind tunnel.
The trams were unidirectional and had a single door at the front and a double door in the middle, both on the right side. Class E also had a single door at the back. The trams were originally delivered with two apartments, with a wall and inside door in front of the center door. This was removed after the trams became smoke-free. They had a partial wooden interior, with linoleum floors. Various renovations changed the paneling, usually variations of brown and yellow. The trams originally had incandescent light bulbs, but these were replaced with fluorescent lamps after 1955. From 1970 to 1974, the trams were rebuilt to remove the conductor, and the driver was given place for a purse and ticket machine, as well as an announcement system. The E-series eventually had the back door taken out of use and blocked with an extra seat.
All but one of the trams had a SV36-bogie from Strømmens Værksted. The two bogies, each with two axles, were attached to the steel crossbeam. The aluminum body was attached to the crossbeam with leaf springs. The bogie frames were fastened to the axle box via a revolute joint and a spiral spring. Each bogie had two motors, each controlling one axle. In 1941, no. 187 was equipped with a SV41-bogie from Strømmen; it had a different spring system that allowed the tram to remain at the same height independent of the weight.
Class E was equipped with disc brakes, while the Class B was equipped with drum brakes. All the trams were equipped with rail brakes, and dynamic brakes. The serial production models were equipped with four 36.6-kilowatt (49.1 hp) ELIN BBFa20 motors. This gave a maximum speed of 65 km/h (40 mph). They were built with two serial motors connected in parallel to the two other serial motors, so each motor used 300 V.
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