When DISNEYLAND first opened Mickey's Toontown in 1993, it featured a rollicking trolley that took guests from Downtown Toontown to Mickey's Neighborhood.
The trolleys were meant to rock and roll down the streets of Toontown. At first, each trolley consisted of two cars connected together. Operations had a hard time getting them to operate the way they were supposed to, so the trolleys were changed to featuring just one car apiece. Soon the rocking was shutoff. Eventually, the trolleys were completely shutdown, becoming static photo opportunities. The trolleys were seen as being an operational nightmare.