Ever take a look at the Titanics engines?
Triple expansion and the final exhaust went to a low pressure steam turbine at around 12 PSI and around 180 degrees...If I remember right.
All the steam ship were converted to oil and as far as I know..every one of the liberty ships were powered by triple expansion steam engines.
Steam powers the world. It just isnt in the form of running engines.
I doubt anyone here can define an engine vs a motor.
The Titanic did not have turbines. It was strictly piston.