Grinder's Switch is a real location just outside of Centerville, Tennessee, which consists of little more than the railroad switch for which it is named. It was also the fictional hometown of Minnie Pearl, the comic character portrayed on the Grand Ole Opry by comedian Sarah Ophelia Colley Cannon, who grew up in the nearby Colleyville neighborhood of Centerville.
https://en.wikipedia.org/wiki/Grinder%27s_Switch