The Great Indian Railway Atlas, now in its 3rd edition, is the most definitive series of maps of India’s railway network. The 120+ page book contains maps in 1:1,000,000 scale which show track status, every station and puts a special focus on closed lines and stations.
Considerable effort has been made to perfect the map symbols and line styles used to depict the network. This self published effort is available on http://indianrailstuff.com/gira3 as well as on Amazon India.