 They ran on the New Haven Line (then part of Penn Central, now a part of Metro North) for most of their service life.The M2 cars were built primarily by General Electric in a consortium with the Budd Company, Canadian Vickers and Avco between 1972 and 1977.They were initially branded as Cosmopolitans; both the model and brand name followed the pattern set up by the M1/M1A series (the Metropolitans) in use on the Long Island Rail Road (M1) and on Metro-North's Hudson and Harlem lines (M1A).