Line 4 of the Guangzhou Metro is a south-north line on the system that runs between Nansha Passenger Port and Huangcun stations, spanning a total of 60.03 km (37.30 mi) with 24 stations (while Guanqiao not yet in service). The sections of the line from Xinzao to Huangcun, Feishajiao to Nansha Passenger Port is underground, while that Jinzhou to Guanqiao is above ground.[4][5] Line 4's colour is dark green. Like line 5 and 6, trains runs with linear motor technology.