They were quite popular in the early days of motoring. They were better for a time as well. Steam was a mature technology.
The problem is, they were a little less practical, requiring some time to heat up, and requiring water to be topped up regularly (although that’s not a major issue). But they’re also less efficient. There’s no real benefit to Steam.
Nuclear power stations use Steam turbines rather than traditional Steam engines, and this has indeed been used for cars, although not production vehicles. https://en.wikipedia.org/wiki/Inspiration_(car)
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