The Northeast Frontier railway (NFR) began the probe into the accident at the Sealkotee Tea estate railway manned-level crossing gate near Chabua.
On July 15, two persons died and another was injured when a vehicle was hit by the Rajdhani Express at the crossing gate.
The gateman who was on duty at the place has been suspended. The gateman has been identified as Munin Sonowal.
According to the prima facie observation, the gateman might have left the rail gate open at the time of the accident. Hence, for dereliction of duty, the gateman has been placed under suspension.
An inquiry into the matter has been initiated by the NF railway.
It may be mentioned that Bimal Sharma (65) and his son Arnab Garg Sharma (30) were killed when the car they were travelling in was hit by the Dibrugarh-Delhi Rajdhani Express.