IT is something the eastern states have ignored for decades. But now, the moment of reckoningseems to have arrived. The threat has assumed alarming proportions and could eventuallylead to a major disaster. Illegal mining, continuing for years in the West Bengal- Biharborder region, is now threatening major portions of National Highway 2 (better known asthe Grand Trunk Road) and mainline railway tracks on which ply a large number of localtrains and critical national ones like the Howrah and Bhubaneshwar Rajdhani Expresses, theDelhi- Howrah Poorva Express and the Kalka Mail, indeed nearly every express or mail trainthat connects Delhi and Calcutta.