- Make Boiler to overheat steam : better fuel -> higher temperature.
- Allow Steam engine to use overheated steam to the full.
- Split 50% efficiency penalty between Boiler and Steam engine.
- Present Steam turbine earlier in the tech tree.
It will motivate player to use solid fuel instead of coal in boilers, invest resources into steam turbines.
Also transition to nuclear power will be easier since player already has turbines.
P.S. It would also be great to see more applications of heat pipes.
Do you think such changes make any sense?