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coupler
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Argentina, Pilar station
detailed video of a scharfenberg coupler in action when a CSR SDD5 chinese locomotive owned by San Martin Line, Argentina goes to the front of a passenger train and acoplate to it meanwhile an old EMD G22 locomotive passes by
All of the horizontal forces of a train are applied to each coupler, these small pieces of steel holding an entire train together. Taken from the sidewalk overlooking King St. Station in Seattle, WA.