Arunachal Pradesh got its first railway station in 2013 - Naharlagun Railways station, which is hardly 10 kilometers from Itanagar. Once a week. Naharlagun New Delhi AC Express departs from Delhi and reaches Naharlagun via Assam, West Bengal, Bihar, Uttar Pradesh. On daily basis, Intercity Guwahati train plies daily on this route. If the time of this train doesn't match your schedule then you can get a train for North Lakhimpur (60 km), which is well connected with Guwahati.