sentences:  The section of US 60 from New Mexico to Amarillo was originally a portion of the Ozark Trail and paralleled the Panhandle and Santa Fe Railway, part of the Atchison, Topeka and Santa Fe Railway.When Texas began numbering their highway system, the Ozark Trail received the numbering of State Highway 13.By 1920, the entire US 60 route had been renumbered as State Highway 33, or its spur SH 33A, with the northeastern portion also following the AT&SF Railway.