I’ve been having a little ‘play’ this morning.
Experimenting with a water vapourisation module (less than £5 on eBay). These are used as forgers in small water features and, I believe, this is the basis of the technology used in the new Hornby steam units.
If I can get it working reliably (very dependent on water level on the reservoir) I intend to install it in the engine shed as a smoke unit for the grandkids to play with, but in the meantime, this photo may give a clue as to what the effect may resemble in the new SS locos.
2022-01-12_11-57-29 by
Steve Mumford, on Flickr