Does it make any difference when programming Lionel AF DCC capable engines whether your smoke slide-switch is in the OFF position? I haven't experimented with that to see, but know from converting Gilbert engines with smoke units to DCC that you have to provide a way to hardwire interrupt connection to the smoke unit or the decoder will see it as a short and not program (process CV changes) the way it ought to. I don't know if the smoke on/off switch on L/AF engines is a hardwire disconnect of the smoke unit or not or if having it in the OFF position makes any difference while programming CV's, but thought I'd throw that out there.
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