Found some time at last to get back to this model again.

So far, I've been able to stick to solid CSG modelling.

The boiler fairing was quite straightforward as expected, being 
basically just a spline lathe. The firebox fairing is a spline prism 
(actually two copies tilted a bit along the boiler axis) and to my 
surprise fits snugly with the lathe.

The smokestack is a blob construct; the upper rim turned out differently 
than planned, but I think it's perfect as it is. I'm a bit worried 
though whether I can use the same approach for the steam dome and sand boxes

Boilerplate "decoration" is just a bunch of rounded boxes and -cylinders.

Well, still a long way to Tipperary...

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