A Model “A” Ford set up as a popcorn truck / Lunch Wagon was, for a time, serving the tourist trade on the streets of Brunswick, Maine. It’s a modern retrofit, it represents a period of transition between horse drawn lunch wagons and modern style self-propelled models, as well as the evolutionary split between lunch wagons and diners.

Here’s a modern company that builds popcorn trucks on antique trucks.
More pictures of the truck