Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I actually meant compound as in combining rather than in the steam sense. My two engines will struggle in the other order due to their construction.
I like your setup with the three engines, shows the principle very well.

Ah i see now!!, it is a good use of exhaust steam that would otherwise be wasted.

I didn't think my three engines would work but they did and on very low pressure i might add too, most likely because each one is very well made. The setup would have worked a lot better with a higher PSI and it isn't a technically a true compound since the three engines are not linked as one. Still it was fun to demonstrate though.