In the early morning of July/Kloc-0, 2003, during the construction of Dongjiadu-Pudong South Road on Line 4, the river-crossing tunnel section was used to connect the upstream and downstream lines, and a large amount of water and quicksand poured in, which caused some structural damage of the tunnel and ground subsidence around it, causing three buildings to tilt seriously, and the flood control wall of Huangpu River partially collapsed and piping. After the accident, the danger was controlled through all-out rescue. The accident directly caused at least three buildings with more than six floors to be demolished within 48 hours, resulting in significant economic losses exceeding 65.438+0.5 billion yuan.

On June 22, 2005, 10, the original Dongfang Road Station of Line 4, which has not yet been opened, was rebuilt and constructed together with Lines 6 and 9. On June 28th, 2006, 10, the original Dongfang Road Station was rebuilt, renamed Century Avenue Station and reopened.

On June 5438+February 3, 2005, the C-shaped line (Damuqiao Station-Lancun Road Station) was opened to traffic, with 22 stations with a total length of 27 kilometers. Hongqiao Road Station to Baoshan Road Station No.9 Station and Line 3 which have been operated are "operated in line". As of August 20 14, 9 of the 26 stations on Line 4 are still operating in line with 9 of the 29 stations on Line 3.

On September 2 1 2007, the restoration project of Dongjiadu Station was completed, and Line 4 ran through the whole line, forming an O-shape with a total length of 33.6 kilometers.

On February 22, 2007, 65438, the debugging of Huantong began.

On February 29, 2007, 65438+, the repair section was put into operation, and Line 4 was operated in a loop.

On June 1 day, 2008, Yishan Road Station and Shanghai Station opened outbound transfer bus cards.

In February 2009, the 42 1-428 train loaned to Line 2 was returned to Line 4, and the transportation capacity of Line 4 increased.

On September 28th, 2009, the time and interval of the first and last buses were adjusted, and the first bus in the inner ring was changed from Damuqiao Station to Yishan Road Station.

On June 65438+1October1day, 2009, Line 4 became the first subway line of Worker Pioneer in China. The sign of "Pioneer Worker" is posted in front of the whole row of vehicles.

On February 28th, 20 10 10 Yishan Road Station realized the transfer with Line 3 and Line 9.

2012 65438+1From October 23rd to 28th, Hailun Road Station was closed for maintenance due to uneven settlement.

20 12 From June 4th, Century Avenue Station, a 4-line interchange hub station, implemented a new interchange scheme on June 9th. In some time periods, it is necessary to bypass some lines to deal with large passenger flow.

In April of 20 13, the National Development and Reform Commission announced the adjustment plan of Shanghai urban rail transit construction, and determined that Line 3 and Line 4 will spend 2.8 billion yuan to carry out branch line reconstruction, which will be completed around 20 15.

2014,65438+1October 30th, a fasting voice was added to the in-car broadcast: "Please consciously abide by the riding rules and do not eat or drink in the car."