Official sources said the team is looking into whether there was a terror angle involved or the accident was due to technical or human error.
It was just an examination of the accident site to draw preliminary inferences whether the case can be taken up by the NIA, they said.
With the Railways suspecting sabotage, Home Ministry was exploring the option of handing over the investigations to NIA, which is nodal agency to probe terror-related cases.
The probe agency, however, had "so far" found no evidence or input to this effect during its probe.
Uttar Pradesh Police has also rubbished the claims of any sabotage in the Railway accident.
Moti Paswan, Uma Shankar and Mukesh Yadav, arrested last week from East Champaran district of Bihar, had claimed that they have received Rs 3 lakh to plant improvised explosive devices (IEDs) at Ghorasahan railway station in the district on October 1 last year.
A team of NIA officials has already gone to Bihar to question the accused and verify their claim.
The trio had reportedly "confessed" to the possible role of ISI in the last year's derailment. They also claimed to be working for the ISI, the sources said.
At least 39 people lost their lives due to the derailment of Hirakhand Express at Vizianagaram district of Andhra Pradesh last night.
Odisha Police, however, ruled out involvement of Naxals in the mishap.
"There is no indication of Maoist's hand behind the derailment," Odisha DGP K B Singh had said.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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