Mexican Southern Railway = Ferrocarril Mexicano del Sur.
MLA
Mexican Southern Railway = Ferrocarril Mexicano Del Sur. Mexican Southern Railway?, 1900. https://collections.library.yale.edu/catalog/15822329.
APA, 6th edition
Mexican Southern Railway = Ferrocarril Mexicano del Sur. (1900). [Maps]. Mexican Southern Railway?, https://collections.library.yale.edu/catalog/15822329.