Construction accident

On August 20, 2001, on 20.10 at Luban Road construction site during excavating the foundation pit, earthmoving sudden landslide, killing four people died who were buried in the landslide.^[4]

At 4 o'clock in the morning on July 1, 2003, the Pudongnan Road-Nanpu Bridge section of Line 4 suddenly saw water seepage during the construction of the connecting passage between the upper and lower tunnels. After that, a large amount of quicksand poured into the tunnel, causing internal and external pressure imbalance, which caused partial collapse of the tunnel. It has a funnel-shaped settlement. At 9 o'clock in the morning, the podium of a nearby building on South Zhongshan Road collapsed; beginning in the early morning of the July 2, the flood wall of Dongjiadu Waima Road section began to sink and crack due to the settlement. The embankment collapsed in a serious accident. The Linjiang Garden Building near the scene also experienced subsidence, the most serious settlement exceeded 7 millimeters (0.28 in) in an hour, and the cumulative settlement reached 15.6 millimeters (0.61 in). This incident affected the plan for the opening of the entire line of Line 4. In August 2004, the Dongjiadu section restoration project was started and it was restored with the opening of the second section in July 2007.^[5] On November 5, 2004, the Shanghai Second Intermediate People's Court issued a judgement on the deputy project manager of the subcontractor for the construction of the intermediate air shaft and side channel freezing method. The court convicted him for the crime of a major liability accident which has a fixed-term imprisonment of two years and six months and a probation of three years. The project director representative has a fixed-term imprisonment of six-month with a probation period of two years. The general contractor's project manager for two years with a fixed-term imprisonment of one year and six months.^[6]

At Hailun Road unbalanced subsidence was discovered. From January 22 to January 28, 2012, it was closed for an overhaul.^[7][8]

Service routes

Shanghai metro line 4 service routes
M - Mainline: Full Loop P - Partial Mainline: Linping Road ↔ Yishan Road
Routes		Station name		3	Connections	Distance			Location	Open- ing	Plat- form[9]
M	P	English	Chinese			km		min
— ↑ Loop line towards Shanghai Indoor Stadium (Outer Loop) ↑ —						1.14	1.14	3
●	●	Yishan Road	宜山路		3 [lower-roman 1]  9	0.00	0.00	0	Xuhui	31 Dec 2005[10]	Underground Island
●		Hongqiao Road	虹桥路	●	10	1.37	1.37	3	Changning		Elevated Side
●		West Yan'an Road	延安西路	●	Yan'an BRT	1.41	2.78	5
●		Zhongshan Park	中山公园	●	2	0.96	3.74	7			Elevated Island
●		Jinshajiang Road	金沙江路	●	13	1.66	5.40	10	Putuo		Elevated Side
●		Caoyang Road	曹杨路	●	11   14 [lower-roman 2]	0.90	6.30	12
●		Zhenping Road	镇坪路	●	7	1.40	7.70	14
●		Zhongtan Road	中潭路	●		1.44	9.14	17
●		Shanghai Railway Station	上海火车站	●	1 [lower-roman 3] SHH	1.72	10.86	19	Jing'an		At-grade Island
●		Baoshan Road	宝山路	●		2.03	12.89	23			Elevated Side
●		Hailun Road	海伦路		10	1.51	14.40	26	Hongkou		Underground Island
●	◐	Linping Road	临平路			1.07	15.47	28			Underground Island & Side
●	●	Dalian Road	大连路		12	1.40	16.87	30	Yangpu		Underground Island
●	●	Yangshupu Road	杨树浦路			0.72	17.59	32
●	●	Pudong Avenue	浦东大道		14	1.44	19.03	35	Pudong
●	●	Century Avenue	世纪大道		2   6   9	1.43	20.46	37
●	●	Pudian Road	浦电路		[lower-roman 4]	0.85	21.31	39
●	●	Lancun Road	蓝村路		6	1.34	22.65	41
●	●	Tangqiao	塘桥			1.21	23.86	44		29 Dec 2007[11]
●	●	Nanpu Bridge	南浦大桥			2.13	25.99	47	Huangpu		Underground Split
●	●	South Xizang Road	西藏南路		8	1.22	27.21	49			Underground Island
●	●	Luban Road	鲁班路			1.47	28.68	51
●	●	Damuqiao Road	大木桥路		12	1.19	29.87	53	Xuhui	31 Dec 2005[10]
●	●	Dong'an Road	东安路		7	0.62	30.49	55
●	●	Shanghai Stadium	上海体育场			1.51	32.00	57
●	●	Shanghai Indoor Stadium	上海体育馆		1	0.67	32.67	59
— ↓ Loop line towards Yishan Road (Inner Loop) ↓ —						1.14	33.81	62
↑ It is the southernmost station shared by lines 3 and 4, although the two lines do not share tracks (the line 3 station is elevated). ↑ Virtual transfer with line 14 – passengers who hold the Shanghai Public Transportation Card and transfer within 30 minutes of exiting the station are able to transfer to other lines without exiting the system. ↑ Virtual transfer with line 1 – passengers who hold the Shanghai Public Transportation Card and transfer within 30 minutes of exiting the station are able to transfer to other lines without exiting the system. ↑ There are two stations named Pudian Road that are about 200 meters apart, Pudian Road on Line 4 and Pudian Road on line 6. Free transfers between the two stations are physically not possible since both are distinct stations located along different parts of Pudian Road. A transfer between the two stations requires users to leave the fare paid area and cross an underground supermarket. This transfer will be counted as two separate journeys requiring two fares.

Important stations

• Shanghai Railway Station: Interchange with line 3. To transfer to line 1, passengers need to exit through a tunnel inside Shanghai railway station and purchase a ticket to re-enter the station.
• Zhongshan Park: Interchange with lines 2 and 3.
• Century Avenue: Interchange with lines 2, 6 and 9. It is Shanghai's first 4-line interchange station.
• South Xizang Road: The first platform-to-platform interchange station in the Shanghai Metro network. Interchange with line 8.
• Shanghai Stadium: Serves Shanghai Stadium.
• Shanghai Indoor Stadium: Serves the sports stadium of the same name and the biggest regional and interregional bus station in the city. Interchange with line 1.
• Jinshajiang Road: Serves East China Normal University. Interchange with lines 3 and 13.
• West Yan'an Road: Serves Donghua University.

Future extensions

There are abandoned plans to end the shared tracks with line 3. Plans include a new underground track for line 4 on the northwestern past.

Station name change

• On 28 October 2006, Dongfang Road was renamed as the Century Avenue after station renovation for line 2 and the opening of line 4.

Signaling

Lines 3 and 4 has been operating over capacity due to large passenger flows for a number of years. With the continuous extensions of operating time, the problems of aging equipment and increasing passenger demand will further increase the operating pressure of the two lines. In June 2021 it was announced that Shanghai Metro has started to update of the signal system of lines 3 and 4 and finish before December 31, 2024.^[13] These are the last lines in the system that are equipped with fixed block Alstom URBALISTM 200 system, not equipped with CBTC systems capable of headways as low as 90 seconds. CASCO successfully won the bid for the renewal and transformation of the signaling for lines 3 and 4 using its self-developed Qiji TACS system.^[14]

Rolling Stock

The line operates with 6-car type A trains.^{[lower-roman 1]}

Former Rolling Stock

• 
  04A01 train
• 
  04A02 train