Boiler Temp


The average steam locomotive boiler temperature wasn't much higher than the boiling temperature, e.g., about 300 degrees. If water is heated to too high a temeparture, say 700 degrees, it all turns to steam and there is nothing left to drive the locomotive. That's why the superheater was developed. You can take steam which has already exited the boiler and heat it to about 600 degrees, so each cubic feet of steam has more BTU's than steam heated to 300 degrees. Every steam engine varied to some degree and those without superheaters never operated at much above 350 degrees.
 
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