If you can possibly get hold of the other two (Darjeeling Himalaya and Kalka-Shimla railway) them do - all three are superb films. Gerry Troyna (the producer) has a consistent track record of making great documentary films about Indian Railways, made all the more watchable in my view as they focus on the stories of the people who live on and work the line, rather than technical details.
There was another excellent mini-series, going back several years now, on Radio 4: it was called Indian Locomotion and presented by Mark Tully. Amazingly I've just discovered that the programmes are still available to stream from the
BBC» website
here.