Line 4 (Shanghai Metro)
Line 4 is a loop line of the Shanghai Metro network. Its older rolling stock carry a bright purple colour belt to differentiate them from Line 3 trains which share a portion of its route, while the newer stock features a yellow and purple livery, which the exact line is labelled using sticker or screens saying “Line 3” or “Line 4”. To determine the direction of travel, the line that travels counter-clockwise is called the Outer Loop (外环), while the other line is known as the Inner Loop (内环). Although it is a loop line, trains returning to the depot use Yishan Road as a terminal to let all passengers disembark. The first segment of the line between Damuqiao Road and Lancun Road (running in a "C"-shape) opened on December 31, 2005. The remainder of the line opened on December 29, 2007. The line is colored purple on system maps.
| Line 4 | |||
|---|---|---|---|
A view of the Yishan Road station. | |||
| Overview | |||
| Other name(s) | M4 (planned name); Pearl line phase II (Chinese: 明珠线二期); Loop line (Chinese: 环线) | ||
| Native name | 上海地铁4号线 | ||
| Status | Operational | ||
| Owner | Shanghai Rail Transit Pearl Line (Phase II) Development Co., Ltd. (except shared track with line 3 portion) | ||
| Locale | Huangpu, Xuhui, Changning, Putuo, Jing'an, Hongkou, Yangpu, and Pudong districts, Shanghai, China | ||
| Termini | Continuous loop from/to Yishan Road (terminal for trains to depot) | ||
| Stations | 26 (of which 9 shared with line 3) | ||
| Service | |||
| Type | Rapid transit | ||
| System | Shanghai Metro | ||
| Operator(s) | Shanghai No. 3 Metro Operation Co. Ltd. | ||
| Depot(s) | Puhuitang Depot | ||
| Rolling stock | 42 Class A 6-car trains | ||
| Daily ridership | 976,000 (2019 Peak) | ||
| History | |||
| Commenced | 2001 | ||
| Opened | December 31, 2005 | ||
| Last extension | September 21, 2007 | ||
| Technical | |||
| Line length | 33.7 km (20.9 mi) (of which 11.57 km (7.2 mi) shared with line 3) | ||
| Number of tracks | 2 | ||
| Character | Underground and elevated (shared track with line 3 portion) | ||
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) | ||
| Electrification | Overhead lines (1500 volts DC) | ||
| Operating speed | 80 km/h (50 mph) Average speed: 32.7 km/h (20 mph) | ||
| Signalling | ALSTOM/CASCO URBALISTM 200 (fixed block CBTC, current) CASCO Qiji TACS (2025 exp.) | ||
| |||