Watt steam engine do you use?

[Ptah]

[baldguy]

2. A small one

[pokerfan]

5. Beat me to it

I saw that a few months ago. And since my first choice of a heat cycle, Stirling, was already posted, I will go with Rankine.

[Brother Buzz]

3. Triple expansion steam engine

Technology even a Luddite can embrace

[oneshooter]

6. How about this set of triple expansion, duel acting.

http://www.bb35library.usstexasbb35.com/OperatingSystems/EngineRoom/enginerm-all.htm

The only known surviving engines of their type.

Oneshooter
Armed and Livin in Texas

[Brother Buzz]

4. Buffalo Springfield

[Mopar151]

7. British "Showman's Engine"

Self-propelled power unit, often used by carnivals to power rides

[Mopar151]

8. A steam shovel or 2

[ohiosmith]

9. This one:

[Lionel Mandrake]

10. An aeolipile, of course.

[Populist_Prole]

11. A sleek S3 4-8-4. Ran lots of miles since it's '93 restoration