The newly opened railroad provided service from Georgetown to Rockville, connecting Rockville to Washington, D.C. by trolley. Trolley service operated for four decades, until, eclipsed by the growing popularity of the automobile, service was halted in August 1935. The Blue Ridge Transportation Company provided bus service for Rockville and Montgomery County from 1924 through 1955. After 1955, Rockville would not see a concerted effort to develop a public transportation infrastructure until the 1970s, when the Washington Metropolitan Area Transit Authority (WMATA) began work to extend the Washington Metro into Rockville and extended Metrobus service into Montgomery County. The Rockville station of Washington Metro began service on July 25, 1984, and the Twinbrook station began service on December 15, 1984. Metrobus service was supplemented by Montgomery County's own Ride On bus service starting in 1979. MARC, Maryland's Rail Commuter service, serves Rockville with its Brunswick line. From Rockville MARC provides service to Union Station in Washington D.C. (southbound) and, Frederick and Martinsburg, West Virginia (northbound), as well as intermediate points. Amtrak, the national passenger rail system, provides service from Rockville to Chicago and Washington D.C.