The Railway Board has recommended a probe by the Central Bureau of Investigation into the devastating multi-train collision, Railway Minister Ashwini Vaishnaw said on June 4. The Board said that “signalling interference” has been identified as the main cause of the accident, which claimed 275 lives and left more than 1,000 injured, adding that the possibility of sabotage has not been ruled out.
“Keeping in mind the circumstances and administrative information received so far, the Railway Board is recommending a CBI inquiry for further investigation into the incident,” Mr. Vaishnaw told journalists in Bhubaneswar on Sunday evening.
Speaking at the crash site in Odisha’s Balasore district earlier in the day, he said that the Commissioner of Railway Safety had completed its own investigation. Saying that the root cause of the collision had been identified as a problem in electronic interlocking — which is the operational signalling system for this stretch of the track — the Minister added that the people responsible for the error had also been identified.
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A group of Home Ministry officials have already visited the accident site and held discussions with Railway officials. At a press conference in the national capital, the Railway Board member for operations and business development Jaya Verma Sinha said that the possibility of sabotage has not been ruled out, insisting that the system could not have “malfunctioned”, and adding that the Ministry of Home Affairs was assisting the Board in its inquiries.
Signalling failure
The accident occurred when the Coromandel Express, travelling on the main line heading south, crashed into a freight train parked on a loop line at the Bahanaga Bazar station. The Yashwantpur-Howrah express, on the main line travelling north, then collided with some of the Coromandel Express’ derailed coaches.
While the Railways have now narrowed down the cause of the accident to signalling, they did not clarify whether the Coromandel Express first derailed on the main line and then hit the freight train parked on the loop line, or whether it had wrongly moved on to the loop line due to “signalling interference”, hit the freight train and then derailed.
Sandeep Mathur, principal executive director of signalling at the Railway Board explained that the electronic interlocking signal system works on two information points: a signal to pass is given based on which direction the track is set, and whether the track is free of obstruction. “As far as the digital record of what happened on that night, the signals sent out were all okay and as expected, but clearly the accident happened and now it has to be determined where the failure took place,” Ms. Sinha said, adding that the tracks are too mangled to even confidently identify which way the switch was pointing before the crash.
‘Not in sync’
The electronic interlocking signalling system is controlled remotely in most cases. However, the controls reside in the section office of the railway station where they are supervised by signal men, section control officers, and section control heads; the station master is also privy to the details.
A senior Railway official said, “Interlocking malfunction is a big thing. There could be two things, either it was a sabotage or it was a software or a hardware malfunction, that is if the switching of tracks [to the loop line] happened despite signal being given for main line. This means that the signal and switching were not in sync.”
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Got green signal: pilot
Ms. Sinha added that the first point of contact after the accident was with the locomotive pilot of the Coromandel Express. “He said that he had received the green signal for the main line and the train went on at top speed. The pilot is now in critical condition and in hospital.”
Given the time of night at which the train was passing through, it sped past as soon as it got the green signal and it would have been virtually impossible for the locomotive pilot to spot any kind of obstruction on the tracks, another senior official said.
Officials added that they had also spoken with the locomotive pilot of the stationary freight train that was hit. “It is a miracle that his life was saved as he had gotten out of the train to take care of some maintenance work when the crash occurred,” Ms. Sinha said.