Officials said its height of 3.921 meters was inspired by Doraemon, a 129.3-centimeter tall robotic cat from the future who has a special pocket from which he produces secret gadgets.

Fifty years into his debut, it's doubtful that Doraemon has his very own train in his magical pouch of gadgets. But now the eponymous robotic cat does, as Seibu Railway Co., which primarily serves ...