Instead, steam, generated by a stationary steam engine, is charged into the locomotive's boiler, which heats up the water already in the boiler to make more steam. One advantage of the fireless locomotive is that it does not produce smoke or sparks, which is particularly beneficial when operating in industries where a fire hazard exists.
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Combustion fired Steam: 121°C Source Wiki: Stirling Boiler Company, Ohio. Later merged with Babcock and Wilcox. These were the earliest boilers. Only saturated steam at low temperature. Therefore, not usable for reaction engineering. Late 1900's: Higher Pressure Combustion and Electric Boilers: 134°C- 162°C: Several manufacturers.
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