5. Dibrugarh Rajdhani Express - Guwahati to Ledo Starting in West Bengal, the super-fast Rajdhani reaches Assam in no time, vast stretches of emerald green paddy and tea plantations on both sides.
Unlike south India's rolling greenery, this expanse is completely flat. As night falls, the train sweeps past the Brahmaputra river on the approach to Guwahati and crawls through the city's slums.