Genuine LEGO Power Functions M-Motor Nr. 8883 6073376 | eBay
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LEGO part 58120c01 - Light Bluish Gray Electric, Motor 9V Power Functions M with Dark Bluish Gray Bottom at BrickScout
I got my husband (who is usually not into Lego) hooked on the idea that we could do a real-life Roller Coaster Tycoon park, so today we got this in the mail