NEW YORK—Fast-moving Tropical Storm Elsa hit the New York City region with heavy rain and high winds Friday, toppling trees and hindering some rail service as it churned its way toward New England. Maximum sustained winds from the storm peaked near 50 mph as it moved past New York City and across the eastern tip of Long Island, the National Hurricane Center said in an 11 a.m. update. Storm conditions caused snags on commuter rail lines across the region, with slight delays on the Harlem Line north of the city and service suspended on the Long Island Rail Road’s Oyster Bay Branch because of fallen trees. The downpour caused a small rock slide under the main railroad track in West Haven, Connecticut, forcing trains to switch to a secondary track for a couple of hours. The coastal city also was dealing with street flooding. “We’re waiting on the water to …