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  2. Rail fastening system - Wikipedia

    en.wikipedia.org/wiki/Rail_fastening_system

    The earliest rail chairs, made of cast iron and introduced around 1800, were used to fix and support cast-iron rails at their ends; [2] they were also used to join adjacent rails. [ 35 ] In the 1830s rolled T-shaped (or single-flanged T parallel rail ) and I-shaped (or double-flanged T parallel or bullhead ) rails were introduced; both required ...

  3. Clamp (tool) - Wikipedia

    en.wikipedia.org/wiki/Clamp_(tool)

    Cardellini clamp – jaw-style clamp that clamps onto round, square, or rectangular tubing; or onto flat objects, such as dimensional lumber or plywood sheets—to mount motion picture lights, or grip equipment such as gobo heads; C-clamp (also G-clamp or G-cramp) (lower centre in the top photo)

  4. Nail (fastener) - Wikipedia

    en.wikipedia.org/wiki/Nail_(fastener)

    In woodworking and construction, a nail is a small object made of metal (or wood, called a tree nail or "trunnel") which is used as a fastener, as a peg to hang something, or sometimes as a decoration. [1] Generally, nails have a sharp point on one end and a flattened head on the other, but headless nails are available.

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  6. Railway coupling - Wikipedia

    en.wikipedia.org/wiki/Railway_coupling

    The Tomlinson coupler is the most widely used fully automatic heavy rail coupling in North America having been adopted by the Washington Metro, Massachusetts Bay Transportation Authority, PATCO Speedline, SEPTA Broad Street Subway, Los Angeles Metro Rail, Baltimore Metro, Miami Metro, MARTA Rail and the New York City Subway for its R44/R46 ...

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