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An HO decoder will have enough capability to drive a smoke unit on the motor output, few smoke units draw more than 600 mA. LED lighting also draws little current so that you can put loads on all the outputs without overloading even an HO decoder. Few decoders have function outputs that will drive a smoke unit but some do. Check the specs.

Most decoders now have sufficiently advanced function controls such that you can program them to simulate the prototypical lighting rules, especially as they relate to train movement.
 
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