Helsinki's tram system officially began in Helsinki in 1891, when the first trams were horse-drawn; with electric drive, it has been in operation continuously since 1900. 13 routes that cover the inner part of the city are operated. , the city is expanding the tram network, with several major tram line construction projects under way. These include the Jokeri light rail (replacing the 550 bus line), roughly along Ring I around the city center, and a new tramway to the island of Laajasalo. Tram line 9 is planned to be extended from Pasila to Ilmala, largely along the new line, and line 6 from Hietalahti first to Eiranranta, later to Hernesaari. New line sections are also planned for the Kalasatama area; construction work on the new tram as the numeber line 13 (Nihti–Kalasatama–Vallilanlaakso–Pasila) has begun in May 2020, and the line is scheduled for completion in 2024. In August 2016, the city council decided to implement the Crown Bridges project, and the goal for the completion of the entire tram connection of the Crown Bridges is 2026.