| APA | Smart Define. (2015). railway locomotive thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/railway_locomotive/thesaurus/narrower |
| Chicago | Smart Define. 2015. "railway locomotive thesaurus" https://smartdefine.org/railway_locomotive/thesaurus/narrower (accessed October 1, 2026). |
| Harvard | Smart Define 2015, railway locomotive thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/railway_locomotive/thesaurus/narrower>. |
| MLA | Smart Define. "railway locomotive thesaurus" 10 April 2015. Web. 1 October 2026. <https://smartdefine.org/railway_locomotive/thesaurus/narrower> |