This is the 3rd edition published in 2015. The earlier editions were published in 2005 and 2010 and are not available now.
This edition is larger in size and much better designed and more informative than the earlier editions. Apart from railway enthusiasts, it is useful for travellers who are interested in the routes which their trains are taking. A further plus (for those who are really interested in the Indian Railways) is that it includes details of stations and lines which no longer exist.
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