Currently, RPF excort about 1270 trains while GRP is being given the responsibility of about 2200 trains in the country.
RPF has also asked its units to stengthen patrolling in those affected divisons to ensure rail property and passengers safe.
Railway zones which are facing Maoist threat include East Central, South Eastern, East Coast, Eastern and South East Central Railway.
The RPF official said the jawan Suknath Debnath Singh, the RPF jawan killed in the Maoist attack on a Patna-bound train in Bihar, was a fresh recruit in the para-military force.
Singh, who completed his training in January this year and posted in the RPSF in May, resisted the attempt by Maoists to snatch rifles from him, the official said.
Besides killing three persons, Maoists also snatched away three rifles from RPF jawans.