Meanwhile, in Germany...

[SteamSewnEmpire]

God I'd kill for a smoke kit like that in Lego. It gets particularly amazing when it starts draining out of the cylinders. Can you imagine doing something like this in our medium? I have to imagine that the piping would all need to be aftermarket, but I am still really intrigued.

[ALCO]

Meh, it needs to alternate coming from the front or rear of the cylinder depending on the stroke. And only for starting out.

[Black Knight]

This is your lucky day, because such a device exists! It's part of the Mould King 12012 Christmas Train set: It's an ultrasound vapor generator that turns water into... (cold) vapor.

I have no idea how good or reliable this device works though. It seems to be pretty big (4 wide) so this won't work very well for 6w steam engines.

[zephyr1934]

That's crazy, even the whistle lets out a little steam. Trouble with something like that is that you'll start hating your existing models because they don't steam.

[bogieman]

8 hours ago, Black Knight said:

This is your lucky day, because such a device exists! It's part of the Mould King 12012 Christmas Train set: It's an ultrasound vapor generator that turns water into... (cold) vapor.

I have no idea how good or reliable this device works though. It seems to be pretty big (4 wide) so this won't work very well for 6w steam engines.

I posted details on my ultrasonic mist "steam" generator several weeks ago here: 

After a lot of trial and error, it seems reliable. I made it 4x5 studs because it fit my application but being 3D printed, it could be made 3 wide without difficulty, it depends on how much water (run time) you want and what space it has to fit. The ultrasonic disc I used is about 19mm in diameter.