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guard line

noun
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Definition of guard line

1 : bearer sense 5b(3)
2 : a line constituting the inner side of the flangeway of a railroad crossing or switch and comprised of guardrails and wing rails — compare gauge line

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“Guard line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/guard%20line. Accessed 12 Jun. 2021.

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