It is that. I hadn’t thought about it until I was uploading it.
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These old machines sure had a certain style about them 
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They print rocket engines in steel alloys…
Out of my budget though.
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One more before I run out of steam. This one will also have the reversing gear so lots of parts left to model.
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Don’t think you’ll ever run out of steam 
Side note. Saw a short video about a steam powered sawmill in Lake Itasca Minn. very cool ! That would make a heck of a model 
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I’ll have to look for that video. Lake Itasca is about 45 minutes from our cabin. There’s a place at Rollag, Minnesota with lots of steam engines. They host the Steam Threshers Reunion every year on Labor Day weekend. Fastest carousel I’ve ever seen is there. It runs on a tiny little steam engine.
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Does it have a steam-operated organ too?
Yes it does.
Unfortunately the old carousel (1896) in the Linnanmäki fairground in Helsinki had been converted to electric drive even before I was born. But the organ is still quite noisy enough.
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Here’s a picture of the engine running the carousel.
And my attempt at getting a picture of my kid riding on it.
I suppose safety concerns led them to change it over. It can be challenging to get and keep boiler certifications here in the US.
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Still need to time the valves but all the parts are there.
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Sweet ! 
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It’s amazing how the level of detail has increased from the last image to this one. I wish I didn’t need so much sleep.
My normal modeling process is to mostly build up from the bottom and from larger elements to the smaller ones. And everything is modeled in place where it will live on the overall model.
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Love the rendering style. Is that simply a straight SU style you made, or are you doing more, like compositing the linework in post?
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Thank you.
For the images like the last one it’s a simple composite thing. I export a hidden line image using a sketchy line style I made…
…and I make a simple clay render image with the same camera position. This gives me the volume and soft shadows…
…which then gets run through an application called FotoSketcher to generate a sketchy shadows image.
The three images are then combined in my image editor. I tweak the opacity of the layers, fine tune levels, and add the sepia color before cropping to final proportions.
Sometimes I just use shadows-only exports from SketchUp instead of bothering with the renderer. With the time and date set differently for each shadow export it’s simple enough to emulate multiple light sources. I did that for the images of the Trevithick dredge engine with the large boiler. Those shadows-only images were then run through FotoSketcher.
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Playing a little more with the latest engine model while waiting for ol’ Santy.
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Beautiful work!