Washington metropolitan area transit problem : Hearings before the Committee on Interstate and Foreign Commerce, House of Representatives, Eighty-third Congress, first session, on H. R. 1555, a bill to provide for an investigation and study by the Interstate Commerce Commission of the adequacy and convenience of passenger carrier facilities and services and the reasonableness of fares in the metropolitan area of the District of Columbia, and for other purposes; H. R. 3771 and S. 922, bills to provide for a commission to regulate the public transportation of passengers by motor vehicle and street railroad within the metropolitan area of Washington, District of Columbia--