Thanks for helping. As you said The Camelback has four chuffs / rev. And maybe you can provide clarity about Lionel's Mikado. I watched a YouTube and I don't know if I'm seeing correctly but as the wheels moved they appeared as three chuffs / rev. Or is the chuff sound out of sync with the driver hitting the 1/4 / rev mark? Can you shed any light if Lionel upgraded the Mikado since this video was made? The engine moves at the 24:00 mark. Here is the link https://tinyurl.com/4nacy6ra
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