here are some fantastic sequences and why I don't think they don''t top the train fight as THE action sequence
batman begins
fantastic car chase which was intense and action packed but it is just a car chase
TDK
hong kong kidnapp - too short
harvey dent armoured envoy/bike sequence - intense sequence and action packed but batman does actually fight anybody
Iron man
eastern europe rescue - too short
air fight - too short
final fight - rubbish, far too cg as pulled right out of the movie
the incredible hulk
final fight - WAYYYYYY too cg, I thought I was watching tekken
hellboy 2
final fight - terrific, but not as good as the train sequence
xmen 2
nightcrawler attacks the the president - terrific too short
wolverine v lady deathstrike - terrific but not as good as the train fight
superman returns
pane rescue - terrific but he isn't actually fighting anyone,
these are MY favorite action sequences (apart from TIH but I thought I'd list it) and have watched them a few times. I still think the train sequence takes it.