The three lines meet in the city center forming a triangle. A revision of the "Nanjing City Master Plan" in 1993 added another line through the urban core, and three light metro lines connecting Nanjing's suburbs in Pukou and the at time proposed new airport.
At the city center, the three lines intersect to form a triangle. In 1993, an update to the "Nanjing City Master Plan" introduced another line through the urban core, and three light metro lines connected Nanjing's suburbs in Pukou and the proposed new airport at that time.