66 Drive-In is a historic drive-in theater along U.S. Route 66 in Carthage, Missouri which opened on September 22, 1949, four years before the first local television stations signed on in the Joplin-Springfield area. In an era before widespread adoption of transistors and before the invention of integrated circuits, car radios were not standard equipment in all vehicles. The few radios installed in vehicles were of vacuum tube design and power-hungry by modern standards.