Four. Official website of Guangzhou Metro shows that the operation headquarters of Guangzhou Metro Group Co., Ltd. belongs to Guangzhou Metro Group Co., Ltd. and is divided into four operation centers. Established on March 9, 2009, Shanghai Metro No.1 Operation Co., Ltd. is the backbone enterprise of Shanghai Shentong Metro Group's rail transit operation and management, and undertakes the operation and management of Shanghai rail transit lines 1, 5, 9 and 10. Shanghai Metro Line 2 Operation Co., Ltd. was established on March 9, 2009. It is the backbone enterprise of Shanghai Shentong Metro Group's rail transit operation management, and undertakes the operation management of Shanghai Metro Line 2, 1 1 line, 13 line and 17 line. Shanghai Metro Line 3 Operation Co., Ltd. was established on March 9, 2009. It is the backbone enterprise of Shanghai Shentong Metro Group's rail transit operation and management, and undertakes the operation and management tasks of Shanghai rail transit lines 3, 4 and 7 and 15. Established on March 7, 2009, Shanghai Metro No.4 Operation Co., Ltd. is the backbone enterprise of rail transit operation management under Shanghai Shentong Metro Group Co., Ltd., which undertakes the operation safety and passenger service of Shanghai rail transit lines 6, 8 and 12, and will soon undertake the operation management task of rail transit line 14.