There was some train that ran on quicklime, or something similar, I don’t remember. Basically you get heat by pouring water on it, which reacts exothermically to create heat and calcium hydroxide. The heat you then use to create steam like a normal steam locomotive. You can “charge” the train back up by turning it into quicklime again by heating it. Theoretically you could do that with concentrated solar power. Aside from the steam turbine, it’s pretty low tech.