NEW YORK (AP) — A marathon day of negotiations that finished early Monday failed to end a strike that shut down the Long Island Rail Road, North America’s largest commuter rail system, setting the stage for a rough start to the work week for about 250,000 commuters. Unions representing rail workers and the Metropolitan Transportation Agency, which runs the railroad, negotiated through much of Sunday and early Monday after some prodding from the National Mediation Board and New York Gov. up...