Marty, I did a web search for MTH Smoke Wick and came up with it. I did note that it was on OGR.
I'm starting to experiment with putting two resistors in Lionel smoke units, I'm tuning the values now to see if I can get better smoke than with one resistor.
I do pretty well with one, but I like spreading the heat around a bit, I think that will help the smoke production. Besides, as you illustrate, it makes it so easy to position the wick.