&tickerText=THIS WEEK IN DISNEY HISTORY ... July 31, 1955 Disneyland opens the Casey Jr. Circus Train. Click for more Disney history.& &URL=javascript:historywindow('http://transfer.go.com/cgi/transfer.dll?srvc=dis&goto=http://disney.go.com/park/channels/vault/history/history.html&name=vault_ticker')&