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My smoke unit is not working for the Lionel 6-38094 Milwaukee Road Hiawatha 4-4-2 Steam Locomotive (2006 Classic Trains Vol. 1 Catalog) and my repair guy, after testing for the reasons why, indicated that I needed part #691-SSMU-FS1.  When looking at the list of parts for that engine, part #691-SSMU-FS1 (SMOKE UNIT PCB / SMART SMOKE *) is listed as sequence #49 in the picture depicting the exploded view of all of the parts for the locomotive; it is priced at $22 and is shown as unavailable.  Going further down the list, the very last part listed--the actual part is not shown in the picture depicting the exploded view of all of the parts for the locomotive and no sequence number of 86 is given, but the part would be sequence #86--is part #630-8095-200 (FAN DRIVEN SMOKE UNIT / SMART SMOKE / 6 OHM / RECT); it is priced at $42 and is shown as in stock.  From what I can see of both parts, part#691-SSMU-FS1 is just the electronic board and part #630-8095-200 looks to be the entire smoke unit assembly...an educated guess.  Is part #630-8095-200 (in stock) the part that replaced or could be used in lieu of part #691-SSMU-FS1 (unavailable)?

I was also wondering, does an asterisk after the description of a part indicate that a different or newer part replaced that part?

Smoke units have been a source of frustration recently--specifically, the Lionel Mickey Celebration LionChief Set engine and the MTH Coors Light Silver Bullet Set engine--and I would like to thank all of the OGR Forum members who have shared their advice/suggestions, especially the links to several YouTube videos.

Janet Mattern (TCA and LCCA member)

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The 6-38094 model is a TMCC loco with Railsounds 5. Just wondering if a SuperChuffer upgrade is possible on this using an alternative smoke unit? Seems odd that Lionel would list a complete smoke unit as a replacement part if it is totally incompatible.

I remember that a year or so ago there was a thread about a LionMaster Big Boy with this same smoke unit PCB although at that stage it was said you had to contact Lionel to order it. (It may be that the asterisk after the part name means that rather than indicating a substitute part can be used.)

FWIW, I have not seen other 6 Ohm smoke units from this period (late TMCC/early Legacy) listed as available from Lionel for a number of years. 

Last edited by Hancock52

You can certainly swap smoke units, it requires a bit of rewiring.  More than one person has taken the smart smoke with the troublesome regulator out and put in a standard smoke unit.  FWIW, if you ever run across a 6 ohm resistor, swap it for an 8 ohm resistor.  Lionel suggested that change years ago, the 6 ohm resistor was too hard on the regulators and was killing them regularly. Even the 8 ohm ones are hard on regulators, I have a batch of regulators on order right now, and two waiting in the corner for the replacements.

I've put Super-Chuffers in all sorts of locomotives, including those with and without various incarnations of smart smoke, and with and without regulators.

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