I was reading a story about the Doble steam car recently, how it differed from other steam autos by using a steam generator rather than a boiler. Now, I know that a good number of diesel locomotives used small steam generators to heat passenger coaches, but did anybody ever run a locomotive with a large steam generator? It would seem to be a good idea where water might be scarce, or a smaller locomotive with full power was needed. Also, a steam generator takes only a couple of minutes to raise a head of steam, whereas a boiler takes probably an hour or more. Of course, you need a fluid fuel source (oil or gas), which might be more efficiently used in an internal combustion engine. I'm sure at some point, an engineer at least did a study...
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