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Amazon.com: LEGO Parts, Bricks, and Pieces - Black Train Parts Combo Pack (6 X Buffer Beam with Sealed Magnets : Toys & Games
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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 Parts, Bricks, and Pieces - Black Train Parts Combo Pack (2 X Buffer Beam with Sealed Magnets and 2 X Train Wheel RC, Holder with 2 Black Train Wheels) : Toys & Games
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