It is likely the bomb was detonated by a remote-controlled device, and timed to cause maximum destruction, as the Brahmaputra Mail passenger service to New Delhi came past at high speed.
Official reports claimed that 33 people were killed in the explosion, but the remote region in which the blast occurred and government desires to minimize the impact of the attack has led some commentators to question this figure.
The Indian government blamed the attack on a local separatist organisation, the Bodo Security Force, although there has been no claim of responsibility.
This was the first major incident involving Brahmaputra Mail, with a second occurring three years later in the Gaisal train disaster.
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