Golden Age (1937-1942):
Best: Snow White and the Seven Dwarfs
Weakest: Saludos Amigos
Package Era (1943-1949):
Best: Song of the South
Weakest: Melody Time
Silver Age (1950-1967):
Best: Cinderella
Weakest: The Sword in the Stone
Post-Walt/Pre-Reinassance (1970-1988):
Best: The Many Adventures of Winnie the Pooh
Weakest: Pete's Dragon
Renaissance (1989-1999):
Best: The Lion King
Weakest: Pocahontas
New Millennium (2000-present):
Best: Toy Story 3
Weakest: Home on the Range
In terms of canon I would probably be the Element of Magic, as I feel I have a little of every one.
In terms of fanon I would probably be the Element of Determination, as I work hard to achieve.
Well I'm into trains too (was and still is a massive Thomas/Railway Series nut). I visited a train museum when I was younger and a few years ago rode an actual steam train on an Easter holiday. These days my favorite public transport is the train system.