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There is a continuous drawbar under all cars.  Traditionally, the drawbar is composed of the two couplers and the center sill under the bottom of the car that runs the full length.  There is some moderate spring action between the couplers and their connection to the ends of the center sill. What you saw was a cushioned car, which basically has the couplers connected to a connecting link with the tradional moderate spring action between the couplers and the link.  Then the two couplers and their connecting link, as a unit, are connected to the center sill by a connection that has extreme spring action that cushions that individual car from the tradtion slack action of the train. The cushion car still has the same amount of slack action as a traditional system, but there is a much greater cushion to isolate the individual car from the normal slack run in and run out.
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