The Texas Mexican Railway International Bridge is an international railway bridge across the Rio Grande and U.S.-Mexico border between Laredo, Texas, and Nuevo Laredo, Tamaulipas, the only rail link between these cities. Owned and operated by Texas Mexican Railway (KCS) and Kansas City Southern de México, the single-track bridge is the busiest rail border crossing in North America. It is also known as the Laredo International Railway Bridge and Puente Negro (The Black Bridge).