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SWS is a hybrid trolleybus prototype that was developed and produced by three Finnish companies Suomen Autoteollisuus (SAT), Wiima and Strömberg in 1979.〔〔 The Helsinki City Transport (HKL) ordered the prototype to gain experience for the future public transportation strategy for city of Helsinki. The trolleybus got its power from the overhead wires, but for wireless parts it had a diesel generator as a power source. The prototype contained advanced technology.〔 The SWS prototype participated in COST 303 project in 1985 among other corresponding prototypes. As a part of the project, SWS was shipped to Belgium, where it served for half year in city of Ghent.〔 Eventually, trolleybus transport was seen too expensive compared to the conventional diesel option, and therefore the City of Helsinki decided to discontinue the trolleybus service and replace it by diesel buses. The SWS trolleybus was kept for possible further investigation.〔 == Background == In 1970 the Helsinki City Transport (HKL) suggested the city council to give up with trolleybus transportation. Instead, the council suggested the city board to extend the trolleybus network. The city transport committee calculated that the planned extensions would demand 70 vehicles. Based on the quotations HKL got, they decided to lease for trials Soviet made ZiU trolleybuses, for which they had got the cheapest offer. The vehicles arrived in February 1973 and they were taken to Wiima factory for converting them to meet the Finnish requirements. The test transportation began in May and continued until November, when the trolleybuses were returned to Soviet Union by rail.〔 The city had received offers for new equipment from different producers, but as the city board did not budget any funds for the project, it remained frozen. The transport committee decided to end the operation by the old vehicles; the trolleybus service, that had begun in the 1940s, was ended in June 1974. In the same month the committee authorised HKL to order 17 trolleybuses and three domestically produced prototypes, if the city board grants the needed funds, which, however, did not happen. HKL sent again inquiries to 14 trolleybus producers in December 1976. In 1977 February the committee made the decision to restart the trolleybus traffic at latest beginning of 1979 and extend it during the following year. A contract of one domestically produced SWS-trolleybus prototype was signed off in December 1977.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「SWS (trolleybus)」の詳細全文を読む スポンサード リンク
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