【明報專訊】DEFECTS in the signaling systems for the MTR's four rail lines resulted in total traffic chaos across Hong Kong. With the disruptions to rail services on the East Rail Line, which lasted for the better part of the day after super typhoon Mangkhut had battered Hong Kong, still fresh in public memory, Hong Kong people could not have foreseen that they would once again be troubled by an MTR incident after just a month.