Thank you!  I've been told that the unit can overheat if there's no liquid in there and potentially damage the engine itself.  If I don't plan on running it w/ smoke do I need to take the whole unit out?

Hello!

I have a 2-6-2 Prairie Union Pacific HO scale.  I believe this is analog and not DCC...how do I turn off the smoke unit?  I have read that I should be able to open the smoke box and see switches but I certainly can't find any way to pop open that part of the train w/o destroying it.

Thanks in advance!