Trains from Siwan Jn (SV) to New Guwahati G/shed (NGC)
No Direct Train!
There is no direct Train between Siwan Jn and New Guwahati G/shed. You can search for Trains from/to any nearby Railway Station, or you can look for alternate modes of Transportation.
For your return journey check list of New Guwahati G/shed to Siwan Jn Trains.