In 1977, the SuperSpeed Tunnel was added to the PeopleMover. It was located in the upper level of the Carousel Building, which then housed America Sings. Race cars were projected on the walls of the tunnel all around the trains. In 1982, the projections were changed to scenes from the film Tron and the tunnel was announced as the Game Grid of Tron by the on-board audio guide. After this addition, the attraction was advertised as the PeopleMover Thru the World of Tron.
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Growing up in Los Angeles in the 70s/80s we visited Disneyland on a regular basis and often after school, before "Annual Passes".