If you think of a steam engine as a machine either any machine is balanced or it will tear itself apart in normally use
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Most steam engines except those used on tourist railroads have been replaced with the more efficient steam turbine engines.
Two triple expansion steam engines and an exhaust turbine
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Of an individual diesel engine and an individual steam engine of the same energy output the diesel engine would be less polluting. It is far more efficient. However, there are far more diesel engines than steam engines in the world today so overall diesel engines pollute more than steam engines.
Yes. Heat engines come in various forms. For example, internal combustion using gasoline or diesel, external combustion (not much used), steam engines reciprocating or turbine, gas turbines, rocket engines.