What’s a diner? This question would be easy to answer in New York, New Jersey, and across much of the Northeastern U.S., where diners abound. In Louisville, not so much. There’s a fine line between a diner and a family restaurant.
If it’s located in an old railroad dining car or a building made to look like one, it’s definitely a diner; but this is by no means a necessity, and in fact I can’t think of any railroad-style diners in or around this town. (If you know of one, please let me know.)