Line S1, Beijing Subway

S1 line
S1
S1 Line under test.
Overview
Other name(s)	M26 (planned name) Line 26 Mentougou Line (Chinese: 门头沟线; pinyin: Méntóugōu Xiàn) Datai Line (Chinese: 大台线; pinyin: Dàtái Xiàn) Beijing Low-speed Maglev (Chinese: 北京低速磁悬浮; pinyin: Běijīng Dīsù Cíxuánfú) Beijing Maglev (Chinese: 北京磁浮; pinyin: Běijīng Cífú)
Type	Rapid Transit, Maglev
System	Beijing Subway
Termini	Shichang Jin'anqiao (Extended to Pingguoyuan in 2019)
Stations	7
Operation
Opened	December 30, 2017
Operator(s)	Beijing Mass Transit Railway Operation Co., Ltd
Technical
Line length	8.25 kilometres (5.13 mi)
Operating speed	110 km/h (68 mph)
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S1 Line (Chinese: S1线; pinyin: S-yī Xiàn) of the Beijing Subway is a rapid transit line. It uses the technology of low-speed maglev. It is operated by the Beijing Mass Transit Railway Operation Co., Ltd. The line was opened on December 30, 2017.

The S1 Line designation is a holdover from a defunct plan to build several suburban railway lines in Beijing. S1 Line was envisioned to reuse the Jingmen Railway connecting Cishousi to Mentougou. The plan was abandoned and the section between Pingguoyuan and Cishousi was replaced with Phase 3 of Line 6, and the other part of the line replaced with the Maglev S1 Line.

S1 Line starts from Pingguoyuan, and goes west towards Mentougou. It is China's 3rd commercial maglev train in operation.

S1 Line uses the low-speed to medium-speed magnetic levitation technology which can give a top speed of 105 kilometers per hour.

A report in February 2013 said all preparatory work was complete and construction would commence "once the National Development and Reform Commission (NDRC) grants its approval."

S1 Line is part of Beijing's attempts to tackle environmental problems caused by heavy car use, coal burning and fast urbanisation. Another reason is that many cities are reportedly upgrading their urban rail systems and introducing green technologies - unlike diesel or coal electric trains do not produce direct emissions.

Six coach maglev trains will be built by the China CNR (by subsidiary Tangshan Railway Vehicle), making it the first domestically built Chinese maglev train.