This is the Keisei Skyliner, the fastest train ride between Narita International Airport just outside Tokyo to the Keisei Ueno Station right next to the very large JR Ueno Station. Very good if you're going to central Tokyo, but if you have to go to the Shinjuku or Shibuya wards or go to the cities of Kawasaki or Yokohama, it would be better to ride the JR Narita Express with its direct runs.