While Railway Minister Ashwini Vaishnaw today said the "root cause" of the horrific triple train collision in Odisha's Balasore, which claimed 288 lives and injured over 1,000 people, has been identified and will be revealed soon in a report, critics have pointed to an audit report of the railways from September last year, which flagged lapses in rail safety. The accident happened due to a change in "electronic interlocking", Mr Vaishnaw has said. The Railway Board has also detailed the sequence of events leading to the crash.