Greyhound commissioned the Kalamazoo Manufacturing Company to build 150 three-wheeled, open-air vehicles called Escorters for the 1964 New York World's Fair. The vehicles were designed with input from Disney, General Motors design chief Harley Earl's firm, and urban planner Robert Moses, who organized the fair.
The Escorter seated passengers on a bench ahead of a driver who doubled as a tour guide. Riders could hire one like a taxi, equipped with a meter, or book it hourly or daily. The vehicle used a fiberglass body over a steel frame, powered by an Onan two-cylinder gasoline engine connected to a hydrostatic drive that pressurized fluid to turn motors for each front wheel.
Only three working Escorters are believed to survive today, with one claimed to have been restored to original condition. That vehicle appeared in the 2015 Disney film Tomorrowland and sold at the 2026 Barrett-Jackson Scottsdale auction in January for an undisclosed price, then resold at another auction in October for $38,000.