1977: At Disneyland's Frontierland, the Mine Train Through Nature's Wonderland attraction closes. (It will later be replaced by Big Thunder Mountain.
Incidentally, I read somewhere earlier today that Big Thunder Mountain Railroad was so realistic that a family of rattlesnakes tried to move in when the Imagineers finished working on it.
You can find out more about what happened on each day in history by visiting http://thisdayindisneyhistory.homestead.com/
