The New Mexico Rail Runner Express is a commuter rail system serving the metropolitan areas of Albuquerque and Santa Fe, New Mexico. It is administered by the New Mexico Department of Transportation (NMDOT) and the Rio Metro Regional Transit District, a regional transportation agency, while Herzog Transit Services currently holds the contract for the operation and maintenance of the line & equipment. Phase I of the system, operating on an existing right-of-way from Belen to Bernalillo that NMDOT purchased from BNSF Railway, opened in July 2006. Phase II, the extension of the line to Santa Fe, opened in December 2008. Daily ridership, as of February 2019, was 2,200 trips per day. In 2023, the system had a ridership of 584,400, or about 1,900 per weekday as of the fourth quarter of 2023.

Albuquerque, also known as ABQ, Burque, and the Duke City, is the most populous city in the U.S. state of New Mexico. Founded in 1706 as La Villa de Alburquerque by Santa Fe de Nuevo México governor Francisco Cuervo y Valdés, and named in honor of Francisco Fernández de la Cueva, 10th Duke of Alburquerque and Viceroy of New Spain, it served as an outpost on El Camino Real linking Mexico City to the northernmost territories of New Spain.