Line 4 is a line of the Suzhou Metro. It runs in a north–south alignment from Longdaobang station in Xiangcheng District's the northern suburbs, to the canal town of Tongli in Wujiang District in the south. The line is 41.5 km long with 31 stations.
Until October 2024 there was a 11.3 km long branch line with 7 stations. This branch line was later transferred to line 7.
History Groundbreaking occurred on December 31, 2010 in Wujiang, and the line was constructed between 2012 and 2016. Operations started on April 15, 2017.
Opening timeline SegmentCommencementLengthStation(s)Name Longdaobang — Tongli April 15, 2017 31 Phase 1
Stations Station name Connections Distance Location 0.000.00Xiangcheng1.291.290.832.121.683.801.445.241.857.09Gusu1.098.18 SZH0.979.151.4510.600.9511.550.5412.091.0113.100.7913.890.6714.561.0015.56Wuzhong0.9816.541.6018.141.9020.041.6821.72Wujiang2.0423.762.9426.701.3928.091.7529.840.8130.651.1631.811.0032.811.1233.931.8935.821.8337.651.7339.381.8941.27
Rolling stock Trains are run in six-car formations, and have a maximum speed of 80 km/h. Fleet numbers Year built Time in service Builder Class Number in service No of car Assembly Rolling stock Number Depots Line assigned Notes 240 (40 sets) 2015-2017 2017-present CSR Nanjing Puzhen B 240 (40 sets) 6 Tc+Mp+M - M + Mp+Tc PM081 040101-044006 (0401-0440) Songling DepotYuanhe YardTian'Edang Yard 60 (10 sets) 2023-2024 2024-present CRRC Nanjing Puzhen B 60 (10 sets) 6 Tc+Mp+M - M + Mp+Tc PM254 044101-045006 (0441-0450) Songling DepotYuanhe YardTian'Edang Yard
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