 No. 158 and 159 were equipped with four 36.5-kilowatt (48.9 hp) Vickers 116E motors. This was a compound motor with regenerative brakes. The trams had sixteen regulating notches and were very complicated to operate. The technology had previously been used in Birmingham, but there the tram company had discontinued them quickly because of their complexity. This complicated set-up was part of the reason for the fatal accident in Sannergata in 1937. The regenerative brakes were removed in the late 1940s. The two trams' motors were prone to technical failures, and spent much time in the workshop. They weighed 12.87 tonnes (12.67 long tons; 14.19 short tons).
