Mandla Fort. ZDM-3A 194 ready to return to Nainpur Jn. This in some ways is as remote as you can get in India at least on railways, it is a 30km branch from Nainpur Jn. which has narrow gauge radiating in four directions, one leg to Nagpur being 290km! And no, there is not a fort in sight! This 35 ton B-B delivering 650hp; it was built in the 1970s and is a mainstay of this system. 17.12.2003. Photograph by Simon Mortimer.