The labourers, who are said to be of Nepali origin, were engaged in the construction of a hotel.
The hapless passengers, who went through the ordeal and horror of the accident, were provided with medical facilities, food and water at various stations, including Malda town and also at Sealdah during the journey, he said.
The employees' unions said that squarely blaming the driver, who is not alive to defend himself, amounts to making him a scapegoat for the systematic shortcomings of the Railways.
The government will look to standardise rules around operations protocol during failure of automatic signalling.
From highways connecting once-remote regions to aviation networks carrying millions, India's infrastructure story is one of transformation.
'The Railways decided to go for kavach three years back, but the progress has been very slow.'
Chairperson of the Railway Board Jaya Varma Sinha said that Kavach, an automatic anti-collision train protection system, is being planned for the route.
Kavach 3.2 version is being installed on approved high-density routes, the railway officials said, adding that upgrading and installation of the latest version on new routes will go on simultaneously to cover a wider railway network in a shorter period.
Meanwhile, the drivers' union rejected the initial probe report alleging "external influence".
The station master of Ranipatra, following the railway operation norms, issued the authority letter T/A 912 to all train drivers to pass through defective signals.
Police found the bomb kept inside an air bag from seat number 22 of S5 coach during routine search of the Kolkata-Guwahati Kanchenjunga Express at the Guwahati Railway Station, sources said.
The revised death toll is nine and 41 were injured.
The prime minister came down heavily on the Congress government in Assam and the previous UPA government at the Centre for "failing" to fulfil dreams and aspiration of the people.