"piggybacking" meaning in English

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        "present participle and gerund of piggyback"
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  "etymology_text": "From piggyback + -ing.",
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          "ref": "1960 November, David Morgan, “\"Piggyback\"—U.S. success story”, in Trains Illustrated, page 684:",
          "text": "Throughout piggybacking's growth the railroads have demonstrated in all areas of the U.S. an ability to equal or exceed highway schedules.",
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