Acharya, who inspected the accident site yesterday, said it may take about two-three days to complete the inquiry and the report will be submitted to the government in a month's time.
The statements of the driver, the assistant driver, a police inspector and a few other people have been recorded, he said, adding that this is first round of questioning and there will be more rounds.
He said samples of the broken railway track have been brought to Kanpur and are being sent for examination to the Research Designs and Standards Organisation's (RDSO) laboratory.
The commissioner told reporters at the Kanpur Railway Station's CTM office that the driver, the assistant driver will be questioned over the accident tomorrow. Passengers have also sent information about the accident to him on his e-mail, Acharya said.
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Whether the coaches were damaged or there was an issue with the track is under probe, he said.
Meanwhile, a 12-member team of Government Railway Police (GRP) personnel was today formed to investigate the derailment.
On being told that the GRP had registered FIRs against unknown people and is also investigating the matter, Acharya said he had nothing to do with the GRP's probe.
carried out amid tight security, with GRP personnel guarding the CTM office at the railway station.
Acharya said his work is to investigate the reasons for the accident, identify the culprits and suggest ways to avoid a similar mishap, but the final action will be decided by the railways.
"My job ends once I submit the report. Future action and improvements for safety will be decided by the railways," he said.
On whether the questioning would end tomorrow, he said, "After I am satisfied that I have received relevant material, I will end the questioning part. The reports will then be compiled and submitted. It will take a month's time."
"Apart from passengers, those who have photos and videos can send them to my office in Kolkata," Acharya said.