Hey Guys,I could be wrong about this,and I probably am,but wasn't the #2026 Lionel's postwar answer to the #1666???
It is still classified as a 'prairie"type boiler,and is the next in line according to Greenburg's geneology of Lionel Steam engines,in Volume 2 Behind The Scenes Reference Book.
What I am saying I guess,is the #1666 eventually became a #2026!!They share the same boiler shell,if you have a postwar #1666.There are 3 or 4 variations on the shell over the years.
And when I said to use a postwar smoke unit,I meant the kind that mount directly to the motor housing,which you would have to drill a hole in the #1666 motor housing to mount it,but also would require some modification to the steam chest and boiler to be able to fit the plunger that is pushed by the drive rods to create the postwar chuff.
Ay yi yi !!!!
Maybe you are better off just to put the Sueth smoke unit in.
I am still gonna try a frankenstein postwar experiment on my #1666,to see if it works!!!! Thanks for the idea!!!!