Like I said previously, check the screws that hold the smoke resistor, those frequently work loose from heating/cooling and then you don't get smoke. If those are tight, and the smoke resistor is reading around 8 ohms, it's most likely the regulator. If the smoke resistor is reading more like six ohms, that's probably why the smoke regulator is dead! You will want to replace that with an 8 ohm smoke resistor, that was a change suggested by Lionel years ago when the 6 ohm resistors were cooking smoke regulators.
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