I got a Train America Studios Turbo Smoke Unit for my Zephyr. www.tastudios.com
Putting it in the Z was a challenge, due to the large motor sticking up in the space. Here's the plan.
I used my drill press to get some accurate holes. I went all the way through, so I could adjust the brass tubing. I'll cover up the holes later.
Here's the whole unit laid out.
Having great fun figuring this out, hope it's worth the effort! Jerry