1976: Washington Metro

(Wikipedia) - ... WMATA approved plans for a 98-mile (158 km) regional system in 1968, and construction on the metro began in 1969, with groundbreaking on December 9. The system opened March 27, 1976, with 4.6 miles (7 kilometers) available on the Red Line with five stations from Rhode Island Avenue to Farragut North, all in the District of Columbia. Arlington County, Virginia was linked to the system on July 1, 1976; Montgomery County, Maryland on February 6, 1978; Prince George's County, Maryland on November 20, 1978; and Fairfax County, Virginia and Alexandria, Virginia on December 17, 1983. Continued

Photo: MDRails