@Rich-O-Brien I agree. I also like seeing what is possible without electronics and computer controllers. Although it might be a bit anachronistic, modeling these steam engines in SketchUp makes it easier to understand how they work and appreciate the designs.

Thank you!

Thanks! There's really not a lot to it. I make multiple copies of the components along their route of travel. There's a different tag applied to each of the copies and then a different one of those tags is visible for each scene. This screen shot shows a simpler engine model with four of the 24 tags turned on. There are 24 scenes for the animation.

It gets a little more complicated with an engine like the horizontal Muncaster because of the steam valve and the linkages.

Here's the resulting animation:
https://flic.kr/p/2n7xvyh

Thank you all.

And because Mike suggested it...

Or another version.