catdoing,
If, your local hobby shop don't have one, then go on line and try Olsen's Trains, or Lionel themselves, but wait for the first week of Aug. 2009, as Lionel is settling in at their new facility in Ohio, U.S.A.
How long have you had yours?
I bought mine in Jun. of this here year and though it is supposedly brand new, it was made in 2002! It's also a T.M.C.C. and in addition to the smoke unit being defective, the rear motor was not seated properly and when in reverse the rear motor would rise up causing a bind in the gears of the rear truck.
I took it to my local hobby shop and I found out that this so called brand new unit was, evidently, not so brand new, only brand new to me!
The smoke unit had to be replaced and the metric mounting screws, holding the rear motor, also had to be replaced with, good ole' American, regular screws and the screw holes, which receive the mounting screws, had to be retapped-"Sold American!"
The new regular-American screws have a better thread-'bite' for holding, compared to the metric screws which have a thinner thread and are easily damaged during the motor's torque movements. In addition to the smoke and motor problems, there were a couple of loose ground wires.
I had posted the problems of my engine and other forum members told me, exactly, what was wrong.
The locomotive is expensive, right away it has problems and the repairs are expensive too! What more can you ask for!
Go figure!
What happened to good ole' American ingenuity?
Good luck in finding the correct-model smoke unit, though they may appear similar, there's differences in their shape, internal parts placement and voltagages, so be careful.
Go on line to the Lionel web.site and look for their parts list. The list will not only give the part number, but other pertinent info. of the part and what engine(s) it is used in.
Ralph