where can I find a smoke unit designed for a building?
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The Lionel burning switch tower uses what are known as Seuthe smoke units. You can find some info here
I have some Seuthe smoke units set aside for some of my builds. You can often find them second hand when people do upgrades on their engines. Just don't let them go dry. and they can get warm, so you should watch against roof paper, and anything that could melt.
