The best replacement for steam engine is diesel engine.

The best alternatives to steam engine are rated as following:
★★★★★  diesel engine
★★★★  steam turbine
★★★  stirling engine
★★  internal combustion
★  internal combustion engine
★  ic engine
★  watt
  john deere tractors
  combustion
  redstone engine

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steam engine
diesel engine
steam turbine