I like smoke because it is an additional moving, dynamic feature of the toy train that is fun. To me it does not make the loco look more authentic or realistic: I've never seen smoke from a toy train that looked realistic, rolling out in slowly dispersing billows that roil and twist away slowly as do real-world 1:1 clouds of smoke). It's just fun. That said, I seldom run with smoke on, because of the odor, which my wife finds very objectionable even in small doses.
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