A 10-person CBI team, which is in Odisha to investigate the triple train tragedy, visited the tracks and signal room at Bahanaga Bazar station in the Balasore district on Tuesday.
They also spoke with railway authorities. On Sunday, the Railway Board recommended that the CBI investigate.
Over 1,200 people were hurt and 278 people lost their lives in the train accident on June 2. Along with speaking with the signal room staff, the forensics team that is following the CBI authorities also inquired about the operation of various pieces of equipment.
As the Railways believe sabotage and outside interference as causes of the disaster, the CBI will look into criminal aspects of the incident.
The signalling system may have been physically tampered with, according to DRM Rinkesh Roy of the Khurda Road Division.
On June 3, the day following the tragedy, the Central agency took over Balasore GRP case No. 64, which had been initially filed by the Odisha Police.
Aditya Choudhury, head public relations officer for South Eastern Railway, stated that the CBI would look at every angle while gathering information.