Waco was served by the Houston & Texas Central (H&TC), the San Antonio & Aransas Pass (SA&AP), the St. Louis Southwestern (SSW, "Cotton Belt"), the Missouri - Kansas - Texas (MKT, "Katy"), and the International & Great Northern (I-GN) railroads The Cotton Belt, SA&AP and H&TC all became part of Southern Pacific. The I-GN became part of Missouri Pacific in the mid 1920s.
