Yanfang Line of the Beijing Subway (Chinese: 北京地铁燕房线; pinyin: běijīng dìtiě yānfáng xiàn) is a rapid transit line in Beijing. It was opened on December 30, 2017.

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Yanfang line
A Yanfang line train between Magezhuang and Dashihedong
Overview
Other name(s)	M25 South (planned name) Line 25 South
Status	Main line in operation
Locale	Fangshan District Beijing
Termini	Yancundong Yanshan
Service
Type	Rapid transit
System	Beijing Subway
Operator(s)	Beijing Metro Operation Administration (BJMOA) Corp., Ltd.[1]
Depot(s)	Yancun North
Rolling stock	4-car Type B (DKZ76, SFM16)
History
Opened	30 December 2017; 6 years ago (2017-12-30)
Technical
Line length	14.4 km (8.9 mi) (main line)[2]
Character	Elevated
Track gauge	1,435 mm (4 ft 8+1⁄2 in)
Operating speed	80 km/h (50 mph)
Route map Legend Yanshan Fangshan Chengguan Fangshan railway Raolefu Magezhuang Dashi river Dashihedong Xingcheng Yancun Liangchen railway Zicaowu planned through train via Fangshan line Fangshan line Yancundong Dongguantou Nan(S) Yancun North depot v t e

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Construction of the Yanfang Line was scheduled to commence in September 2011 and be completed by 2013.^[3] On October 17, 2011, the Ministry of Environmental Protection declined to approve plans for the line citing lack of approval for the project from the National Development and Reform Commission and uncertain environmental impact of the line on the South–North Water Transfer Project which has a channel and reservoir in Fangshan District.^[4][5] As a result, the onset of construction was delayed to at least the end of 2013.^[5]

Construction on Yanfang Line was started in April 2014. The line was scheduled to open in 2017.^[6] The line opened on December 30, 2017.

The line is projected to be Y-shaped, with the main line starting at Yanshan and the branch line starting at Zhoukoudian Town. The two will merge at Raolefu before terminating at Yancundong.^[3] Currently only the main line is operational, while the branch line is under planning.

The line is the first in Beijing to be capable of unattended train operations, and the first in China to exclusively use subsystems developed by domestic manufacturers.^[8]

The 6.1 km (3.8 mi) branch line of Yanfang line, from Raolefu station to Zhoukoudian Town station is under planning. Due to low passenger flow, the branch line will not be built in the short-term planning.^[9] In addition, Beijing Subway is evaluating the possibile merge with the Fangshan line.