the time, and was connected to the rest of the network in 1953. From 1955 to 1988, German-built trams were used. The first Czechoslovakian-built tram arrived in 1973. In 2007, 56 Tatra KT4SUs, 12 KTNF6s (rebuilt KT4SUs) and 23 second-hand KT4Ds trams were in use. There are four lines, with total length of tramlines 39 km. Plans have been in the works since the late 1970s to open a light rail line from one of the suburbs, Lasnamäe, to the city centre. In 2017, an extension was opened to Tallinn Airport. This is the first extension to the network since 1955, when the stretch to Ülemiste district was lengthened. The track and electrical systems have also undergone major work to enable the system to accommodate 20 new vehicles delivered by CAF in 2016. Finland In Finland, there have been four cities with trams: Helsinki, Turku, Viipuri and Tampere. Of the three older systems only Helsinki has retained its tram network. The system has operated continuously since 1891 and it was fully electrified by 1901. Currently there are 10 tram lines on 89.5 kilometres of track. Around 200,000 passengers use the tram network each weekday and within the inner city of Helsinki trams have established a position as the main form of public transport. The network is being actively developed, with a new line opened in 2008 and more lines planned to connect new residential areas to be built in 2009–2015. In 2009, the city invited bids for manufacturers to produce 40 new low-floor trams, with an option for further 50 available. The City of Tampere begun construction of a tram network in early 2017, with phase 1 from the city centre to Hervanta, and the University Hospital. The first phase of the tram system was opened in 2021. Construction of phase 2, from the city centre to Lentävänniemi in the west, begun in 2021 and is expected to be completed in 2024. The cities of Oulu and Turku have started the planning of tram networks. Turku has accepted The Light Rail Network of Turku's principal plan as obeyed normatively. Even though Oulu's vice mayor rejected the idea, the city included it in The Zoning Scheme of New Oulu as "normative" and "necessary". France Despite the closure of most of France's tram systems in previous decades, a rapidly growing number of France's major cities boast new tram networks, including Paris (the