If the smoke resistor is getting hot, check the 5V DC regulator circuit on the smoke PCB. If the resistor isn't getting hot, and it's not open, it's probably the voltage regulator module. I'd also replace the 6 ohm smoke resistor with the 8 ohm one, that was a recommended Lionel mod as the 6 ohm resistor was drawing excessive current and cooking the voltage regulator modules.
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