The journey from Thiruthuraipoondi to Guwahati covers about 2800 km. You should travel to Chennai to catch a direct train to Guwahati. The journey takes approximately 55 to 60 hours. Guwahati is the gateway to Northeast India and is located on the banks of the Brahmaputra River.
Total Distance: Driving distance 2900 km, straight-line air distance 2200 km.
This is a very long journey; prepare for multiple days on the train.
October to April, when the weather is pleasant.