It is traditional for a plaque to be placed above the tunnels under Main Street Station...
...seeing it at Disneyland makes me cry every time. The plaque reads: "Here you leave today and enter the world of yesterday, tomorrow and fantasy" The words just don't seem as special here as they do right before you go under the tunnel and enter Main Street U.S.A for the first time. 
It was a busy day here, and I appreciate all who waved as they went past. It seems as if people used to stop and take notice of me, a lot more than these days. I suspect that it is just a change in culture and lifestyle, to hurry towards each destination...Disneyland was a much more formal place back then.