a casual restaurant, often in a long narrow building resembling a train car, that serves simple meals like burgers and breakfast food.
From 'dine' (to eat dinner) plus the agent suffix '-er.' The diner as an American institution emerged in the early 1900s when manufacturers began making prefabricated restaurant cars that resembled train dining cars, which is why classic diners have that distinctive streamlined look.
American diners are a perfect example of industrial design meeting food culture—those chrome and red vinyl booths weren't random choices but were inspired by real train cars, and they became so iconic that diners still copy this 100-year-old design today.
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