Line 3 (Shenzhen Metro)

Shenzhen Metro Line 3 (formerly branded as Longgang line), runs northeastward from to. Line 3 opened on 28 December 2010. Line 3's color is blue.

Since opening, it has been heavily trafficked and became a major transport option for urban workers. Line 3 currently has a service interval of 5 minutes between trains across the entire length of the line. Sectional trains operate on weekdays, between Huaxin and Tangkeng, from 7:15 am to 9:15 am and from 5:45 pm to 7:45 pm. This is to alleviate surges in passenger traffic at, since the opening of the connecting.

History
The first phase of Shenzhen Metro Line 3 started construction in July 2007. On 23 April 2008, the Shenzhen Municipal Planning Bureau renamed the still under construction Shenzhen Metro Line 3 to "Longgang Line". The renaming was later reverted in 2013.

First stage
The first phase of the line from to  stations officially began operations on 28 December 2010. This section is almost entirely elevated except near. It starts from Longgang District and runs mainly along Shenhui Road, to Luohu District. The first phase has 16 stations, with a total length of 25.138 km.

Second stage
The first phase (underground section) of the line from to  stations and the second phase of the line from  to  stations, opened on 28 June 2011.

Third stage
The third phase of the line from to  stations, opened on 28 October 2020.

Future development
With the start of Shenzhen Metro's Phase IV construction, Line 3 will be extended on eastern end.

Eastern extension
A 9.4 km eastern extension to Pingdi Liulian station (further into Longgang District) is under construction.

Long term plans
Long term plans include extending Line 3 even further east into neighboring Huizhou City along with Line 12. On 7 August 2013 a "Memorandum of Cooperation" was signed to coordinate transport planning and urban development between the two cities, formalizing the planning process for the proposal.

Service routes

 * — (Before 11:00 PM)
 * — (Working days peak hours only)
 * Some train services from Futian Bonded Area to Tangkeng (usually at peak hours and 11:00 PM to 11:30 PM).
 * Some train services from Shuanglong to Huaxin (usually at peak hours and 11:00 PM to 11:30 PM).