"quirkiest" meaning in English

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          "ref": "2023 January 11, Richard Foster, “British Rail's weirdest railways...: Northern Counties Commission”, in RAIL, number 974, page 46:",
          "text": "Of all the quirks of railway history that gave rise to the lines in this list, the quirkiest has to be that British Railways was (albeit briefly) responsible for a network of lines in Northern Ireland.",
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