Best train to see the beauty of Koraput - Rayagada section, which is loaded with Tunnels, tall bridges, thick forests, hills, vast agricultural lands, village tribes, animals ... i mean the train route from Koraput to Rayagada is absolutely BEAUTIFUL.
This train runs fairly empty until Rayagada, so you wont find any trouble getting a window seat / door spot :-)
The mini-samosa's sold by the local vendors for breakfast after the train crosses Damanjodi are super yummy :-)
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If you are visiting Jagdalpur, there are 2 phenomenal waterfalls within an hours drive: Tiratgarh Falls & Chitrakot Falls (dont forget to take the boat ride here). Definitely worth visiting !!