Hello,

this is a steam engine with two pistons. Why two?
Because one was not enough!
At the front are the two cylinders in which the pistons move forwards and backwards.
Steam is conducted through pipes with valves and gauges into the cylinders.
The pistons then push a rod connected to a flywheel which stores kinetic energy.
You could also replace the flywheel with a generator which then acts as a flywheel.

Enjoy!