 The RTM ("Rotterdamsche Tramweg Maatschappij") was founded in 1878 to operate the first horse-drawn tramway in Rotterdam, which opened in 1879.From then until 1904, the RTM ran both horse trams and steam trams in and around the city, which was then much smaller than today.Apart from the RTM, there were two other, smaller, companies operating tramway networks in and around Rotterdam in the late nineteenth and early twentieth centuries.