side, and the older Cx series and newer C30 having 24), it is unlikely platform doors will be common anytime soon. The underground Liseberg station in Gothenburg has platform doors which were built before its opening 1993. The reason was safety against the freight trains that go in this tunnel. These doors are built one meter from the platform edge and do not restrict the train type. Switzerland Zurich International Airport's Skymetro shuttle between the main building (hosting terminals A and B) and the detached terminal E has glass screen doors separating the tracks from the passenger hall platforms at both ends. Lausanne Metro's Line M2 has glass screen doors at every station. Taiwan On Taipei Metro, platform screen doors were first installed on the Wenhu line (then known as Muzha line) in 1996. Older high-capacity MRT lines (Tamsui-Xinyi Line, Songshan-Xindian Line, Zhonghe-Xinlu line, and the Bannan Line) were initially constructed without platform screen doors but have been retrofitted with automatic platform gates since 2018. Newer stations, on the Xinyi Line (part of the Tamsui-Xinyi Line), Luzhou and Xinzhuang Line (part of the Zhonghe-Xinlu Line), Songshan Line (part of the Songshan-Xindian Line), Circular line, and part of the Bannan Line's Dingpu Station and Taipei Nangang Exhibition Center Station) are constructed with platform screen doors. The Circular Line have installed platform screen doors since opening, but Danhai Light Rail did not. On Kaohsiung Metro, all underground stations have installed platform screen doors, while elevated stations did not. Daliao Station installed half-height platform screen doors in 2020. On Taoyuan Metro and Taichung Metro, all elevated stations installed half-height platform screen doors while underground stations installed full-height platform screen doors. Thailand Platform screen doors were first installed on the BTS Skytrain and Bangkok MRT System since it first operates. Followed by the Airport Rail Link System in Makkasan Station (Express Platform) and Suvarnabhumi Station (both City and Express Line Platform. BTS Skytrain system first installed the platform screen doors at Siam Station. Followed by all the busy stations during rush hours. Today, almost all stations on the Bangkok Electrified Rail System have installed platform screen doors preventing people from falling onto the tracks. BTS Skytrain system has installed PSDs on 18 stations out of its 44 stations. Both Purple and Blue Line of Bangkok MRT system has installed PSDs on all of its stations. Airport Rail link has installed a stainless steel fence