 Following some expansion of the system, the company experimented with a steam tram in 1880, and in 1884 bought the first two steam tram locomotives and a second-hand trailer car.The first public steam tram service ran on 20 June 1885, and most but not all of the horse trams were gradually replaced by steam tram locomotives pulling trailer cars, some of which were bought new, while others were made from pairs of redundant horse trams.By the mid-1890s, there were 13 tram locomotives and ten trailer cars operating on the system, as well as ten double deck horse trams.