Pudong Terminal 2 to East Nanjing Road Metro

If I catch the Maglev from PVG airport to Longyang Road - so that I can transfer to Line 2 to East Nanjing Road, do I have to change trains on Line 2, or just stay on the train from Longyang all the way to East Nanjing Road (5 stops)? Some sites say:
"..the east extention part (Guanglan Road - Pudong Airport) is running separately from the other part. There only have 4-car metro train, the other have 8-car metro train. Passengers should change the train at Guanglan Road Station...." this is confusing.