High temperatures caused a “heat kink” along a stretch of Metrorail track, officials said, closing a portion of Green Line service throughout the weekend and likely impacting the Monday morning rush hour. Service between Fort Totten and Prince George’s Plaza was suspended Saturday and Sunday while crews repaired the 1,000-foot section of track bent out of shape because of the hot weather. Metro officials announced Sunday night that service had restarted between the two stations, but trains were single-tracking.