Yoakum's planned extensions of the GCL from Brownsville to Tampico and Mexico City, as well as from Baton Rouge to Memphis, never materialized.
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Yoakum's plan envisioned using the Rock Island and Frisco, together with several railroads to be built in Texas and Louisiana and now known as the Gulf Coast Lines, to form a continuous line of railroad extending from Chicago, St. Louis and Memphis to Baton Rouge, Houston, Brownsville, Tampico and Mexico City.