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LEGO part 87574c01 - Black Electric, Train Motor 9V RC Train with Integrated PF Attachment, Orange Wheel Holders (motor only, no attached wheels) at BrickScout
LEGO Power Functions Train Motor 88002 4584375 for sale online | eBay
LEGO Powered UP: Train Motor (88011) for sale online | eBay
High-Tech Parts Motor Multi Power Functions Tool Train Motor 88002 Building Block Motor for Power Functions - Walmart.com