Twenty-nine new trains have also been launched to facilitate movement of the people of the region.
The railways has laid emphasis on improving its infrastructure in the Northeast, said a senior railway ministry official.
The projects involve laying of 12 new lines and doubling of four lines at an estimated cost of Rs 43,771 crore.
These projects will add 1,664km tracks in the region.
The northeastern region consists of eight states -- Assam, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya and Sikkim.
The entire metre-gauge section in the region has also been fully converted into broad-gauge line, the official said.
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