TS Class 6 was a series of 28 trams and 15 trailers built by Strømmens Værksted for Trondheim Sporvei. They were delivered in two slightly different batches; ten in 1948–49 and six in 1955.On 10 October 1956, almost all operative trams used by the company were lost to the flames. Subsequently, Trondheim Sporvei ordered the Class 6 from Strømmen. Five engines were salvaged from the fire, and were reused in trams 1 through 5. The remaining deliveries were numbered 10–32.