Name the Indian Railway's Short film which bagged the 'Rajat-Kamal' award at the 66th National Film Awards for 2018.

A short-film 'Madhubani - The Station of Colours', bagged the 'Rajat-Kamal' award at the 66th National Film Awards for 2018. It narrates the beautification of a remote railway station belonging to the East Central Railway (ECR). The Madhubani railway station located in a remote part of Madhubani district of Bihar was earlier ranked as the country's second most dirty railway station.