Worlds fastest airport train?

When I return from Shanghai and take the airport train from Oslo airport, Gardermo-banen, and see the claims "Verdens raskeste flytog" it always baffles me? Gardermo-banen aiport train reaches a top speed of 210 km/hour while the Shanghai airport train reached 431 km/hour when I took it, which is more than double.

However, it is true, in fact Gardermo-banen is the "world's fastest average-speed airport train on conventional rails". Somewhat like saying "being best on wooden skis" like Aftenposten puts it.

Here is Aftenposten's story in 2010.
http://www.aftenposten.no/nyheter/iriks/Skryter-av-a-vare-verdens-raskeste-5314238.html#.UWrzkbVHKSo