[preliminary investigation results of Indian train derailment collision accident: accident caused by changes in electronic interlocking devices] according to Indian media reports on June 4, Indian Railways Minister Ashwini Vishnau said that the Railway Safety Commissioner has conducted an investigation into the train derailment collision accident in India and issued an investigation report to determine the cause of the accident and those responsible. He pointed out that a preliminary investigation showed that the accident was caused by a change in the electronic interlocking device.