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.
The three lines intersect in the city center to create a triangle. In 1993, an update to the "Nanjing City Master Plan" added another line through the urban core, and light metro lines linked Nanjing's suburbs in Pukou and the proposed new airport.