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technology system(noun, technology, entity, form, concept)
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APASmart Define. (-0001). train protection & warning system thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/train_protection_%26_warning_system/thesaurus/related
ChicagoSmart Define. -0001. "train protection & warning system thesaurus" https://smartdefine.org/train_protection_%26_warning_system/thesaurus/related (accessed September 30, 2026).
HarvardSmart Define -0001, train protection & warning system thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/train_protection_%26_warning_system/thesaurus/related>.
MLASmart Define. "train protection & warning system thesaurus" 30 November -0001. Web. 30 September 2026. <https://smartdefine.org/train_protection_%26_warning_system/thesaurus/related>