Four days after a 33-year-old Railway Protection Force constable, Chetan Singh, was arrested for allegedly killing four persons including his senior in Jaipur-Mumbai Central Superfast Express, the investigators on Friday recreated the crime scene inside coaches B5 to S6 of the train where the incident took place.

GRP Commissioner Ravindra Shisve and a team of investigators visited the train parked in the car shed at Mumbai Central along with the complainant Amay Acharya, who is also an RPF constable.

A senior police officer said the recreation of the scene inside the train lasted for nearly two hours.

“The coaches of the train in which the incident took place have not been stopped from operating and the team visited the train after it had come for washing at the Mumbai Central railway station,” said an official.

A forensic team had visited the train on Monday afternoon immediately after the incident for further examination.  Singh is currently in police custody till Monday after he was arrested for allegedly firing at ASI Tikaram Meena and three other passengers identified as Abdul Kadar Mohamed Hussain Bhanpurawala, Syed Saifuddin and Asgar Abbas Sheikh early on July 31. The FIR reads that Singh was angry after his senior Meena refused to relieve him early from his duty despite reporting that he was unwell.

The RPF man initially shot at his senior following which he went and fired at three passengers of the train. An officer said, “We have recorded the statements of more than 100 individuals related to the case of which around 20 statements are of key witnesses that will help us in building a water-tight case.”

When asked whether the police have managed to find the person who recorded the video, a senior police officer refused to confirm or deny as Singh is seen taking names of senior politicians.

The police said that Singh has not been cooperating with the investigation due to which they are unable to ascertain the motive behind the killings.

“In the custody also he is behaving in such a way that he is mentally unstable, but we are not falling for it and probing the case thoroughly,” said an official.

The investigators, meanwhile, claimed that they have managed to obtain CCTV footage of the coaches in which the incident has taken place. “Although we have not been able to get the footage of him firing, we have got some scenes in which he could be seen moving around the coaches aggressively,” said another official.