Give a stream of consciousness and then the final answer. Vivek Express is a chain of express trains on the Indian Railways network. These trains were announced in the Railway Budget of 2011-12 by the then Railway Minister. These trains were started to commemorate the 150th birth anniversary of Swami Vivekananda, to be held in 2013. One of the Vivek Express trains, the one from Dibrugarh to Kanyakumari; is the longest route on the Indian Railways network, in terms of distance and time, and is the 9th longest in the world.

Answer this question: which is the longest running train in india?
The important part for answering this question is: One of the Vivek Express trains, the one from Dibrugarh to Kanyakumari; is the longest route on the Indian Railways network, in terms of distance and time, and is the 9th longest in the world.
So, the final answer is One of the Vivek Express trains , the one from Dibrugarh to Kanyakumari.