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Train Buffer Beam with Black Train Coupling with Pin and Black Magnet Cylindrical (4022 / 4023 / 73092) : Part 4022c01 | BrickLink
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electromagnetism - How do Lego train carriages couple together no matter how you place them? - Physics Stack Exchange
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Amazon.com: LEGO City Cargo Train 60198 Exclusive Remote Control Train Building Set with Tracks for Kids, Top Present for Boys and Girls (1226 Pieces) : Toys & Games
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