There is an awesome one at Tokyo Station (Chuo line?) Up about two stories, then horizontal for 10 meters, then up another two stories. Ya, I could spend hours on that one....
and/or watch this: http://www.youtube.com/watch?v=QbZ7jrMe4t4
this too! http://www.youtube.com/watch?feature=endscreen&NR=1&...
http://en.wikipedia.org/wiki/File:North_Ryde_station_escalat...
Longest in Tokyo is Shinochanomizu station:
http://www.youtube.com/watch?v=CuQTlvWEmbM
Please stand on the left hand side.