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Semi-permanent coupler for metro or Irv(with buffer)_Products and Services_Coupler and Draft Gear_Coupler and Draft Gear_CRRC QINGDAO SIFANG ROLLING STOCK RESEARCH INSTOTUTE CO., LTD.
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What allows for semi-permanent couplers (or any coupler in general) to allow for slight vertical movements? : r/trains
Why is CBC coupling not used in Train 18? What type of coupling is used in train 18? - Indian Railways Space - Quora
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