This one sort of defies an easy categorization between the real thing and a model..somewhere in between as a hybrid. I cannot believe the craftsmanship..no smoke pellets required or hard anthracite. This somewhat relates to the subject of the thread regarding electrically produced steam in prototype engines..only in surprisingly enough.. HO
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All I can say is, "wow"! Our autos shrank, our electronics are tiny, now this! Maybe mankind's body size will begin to grow shorter in the future so as to adapt. 
Hornby had a commercially available HO scale live steam locomotive some years ago. In reality, it's not much different than a teapot on an electric range.
However, there's a big difference between the small capacity, low pressure requirements of an HO scale boiler and the higher capacity and pressure requirements of a prototype steam locomotive.
Rusty
OK,
I'm Stuck in Stupid. 
What was the purpose of:
The compressed air was to test the cylinders without having to steam up.
The fan is to induce a draft in the firebox to get the fire going.
Very interesting. Apparently this loco runs on propane fuel in the tender and the steam controls are all manual, with operating valve gear for reversing. Unfortunately they had only a short straight test track for a demonstration run.
I believe the Hornby HO steam locos use electric heating from track power and some sort of remote control, also through manipulation of the track power.
Live steam engines in larger scales (1:8 and 1:12) also typically use an electric fan on the stack to create a draft for firing up a cold engine.
Very interesting. Apparently this loco runs on propane fuel in the tender...
More likely it is butane.
Live steam engines in larger scales (1:8 and 1:12) also typically use an electric fan on the stack to create a draft for firing up a cold engine.
We also used a "stack fan" to induce a draft when firing up a cold 1630 and J. Neils #5 at IRM.
Rusty
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