Schweizerische Industrie Gesellschaft
In 1979, TT started working on the process of ordering new trams. The whole fleet of Class 7 trams was from 1958, and these would soon need replacement. Invitations to tenders were sent in July 1980. A study trip was taken by seven people to the factories of ČKD Tatra in Czechoslovakia and Düwag in Germany. They also looked at the tramways in Brno and Essen. By 1 December, eight bids had come in from La Brugeoise et Nivelles (BN), Linke-Hofmann-Busch (LHB), Strømmens Værksted, Düwag, Schweizerische Industrie Gesellschaft, Valmet, Waggon Union and Pragoinvest/Tatra.