What is the name of one of the holiest places in India to Hindus that used to be accessible via the MG Ganga Kavery Express?
Ganga Kaveri Express:  Inaugurated on 16 February 1977 by Kamalpati Tripathi, between Madras (now Chennai) and Varanasi, was terminating at Chennai Beach Station, from where MG Ganga Kaveri Express used to run to Rameswaram through the Kaveri river basin. Rameswaram:  Together with Varanasi, it is considered to be one of the holiest places in India to Hindus, and part of the Char Dham pilgrimage.
Rameswaram