The Navajo Mine Railroad (reporting mark TNMR) is an electrified private railroad operating in New Mexico, USA, within the Navajo Nation. It operates 14 miles (23 km) of track between the Four Corners Generating Station and BHP Billiton's Navajo Coal Mine.
It was initially built in 1974 and expanded to the present 14 miles in 1984.
The line runs from the Navajo Mine north-northwest to the Four Corners Generating Station, which is located 25 miles west of Farmington, New Mexico. It has no connection to any other railroad.