instead of purchasing new rolling stock for the gråkallen line, the city trams were to start operating on the line. however, there was a lack of material in trondheim sporvei, and not until 7 november 1966 could a ts class 7 city tram be taken into use. this was supplemented with a trailer on 6 february 1967. also, there was operated a direct route from lian to lade during the morning rush hour. in 1968, the company acquired five additional trams. however, trondheim sporvei had problems delivering the trams. with this deal in place, the oldest trams could be retired. however, from 30 june to 19 august 1968, trondheim sporvei needed the trams again, and the old class 1 was back in service. the final run of the class 1 in regular service was on 29 november 1968. from 19 may 1969 the trams lost their conductors.