The 80 hour trip from Dibrugarh to Kanyakumari is the longest passenger train journey in which country?

Dibrugarh–Kanyakumari Vivek Express is a weekly Express train of the Vivek Express series of the Indian Railways, which runs from Dibrugarh in India's north eastern state Assam to Kanyakumari in Tamil Nadu the southernmost state of India.

The journey is close to 80 hours and the train covers a distance of 4,218.6 kilometres (2,621.3 mi) and traverses through nine states in India. This train is currently the longest train route in India by both distance and time, as well as the 24th-longest train service in the world. The train has 58 halts across its route.

Vivek Express are four pairs of Express Trains on the Indian Railways network. These trains were announced in the Railway Budget of 2011-12 by the then Railway Minister Mamata Banerjee. These trains were started to commemorate the 150th birth anniversary of Swami Vivekananda (an Indian Hindu monk).