text: Nanjing Metro100px275pxA Line 1 train at Sanshan Street stationOverviewLocaleNanjing, JiangsuTransit typeRapid transitNumber of lines10 metro linesNumber of stations159Daily ridership3.106 million(March 2018 avg.)4.002 million(30 September 2018 peak)Annual ridership977.4 million (2017)OperationBegan operation3 September 2005Number of vehicles202 trainsTechnicalSystem length377 km (234 mi)Track gauge1,435 mm (4 ft 8 1⁄2 in) standard gaugeElectrification5 kV DC overhead lines