What fun. I have been to four of the 24 most busy railway stations in the world, ok, three were in Japan.
8. Tokyo (we just followed the signs. So simple)
17. Omiya ( it did not seem big. We were on our way to the transport museum, on from Omiya on a rubber tyred guided driverless train)
22. Ueno (yes, it is big and busy, but not crowded and user friendly)
24. Gare du Nord (I don't think it should be on the list, only there because it seems really busy because of British passport control for Eurostar)
I am not saying the stats are dodgy but if you want a feeling of a busy station that is not coping with the numbers travelling, try Melbourne's South Yarra Station at 8am or Sydney's Town Hall Station, also at 8am. Forget the stats. Australia does the perception of crowded and busy stations in first world countries better than anywhere else in the world, methinks.