Six elephants, including two calves, were killed when the Chennai-bound Coromandel Express dashed against an elephant herd passing through the track in Odisha's Ganjam district. The mishap took place shortly after midnight on December 30.
Besides, 67 animals died during the review period of 2006-11 which included 62 elephants and one lion.
According to the CAG, a large number of wild species are being killed due to accidents in railway tracks and highways but data maintained are very meagre.
Data is, however, available for large animals like elephants, the CAG noted.
"Despite some initiatives by Railways like imposition of speed restrictions, display of signages and regular clearance of vegetation along the track, animal mortality rate due to train hit had not declined," the CAG said in its latest report.
The Railway and Environment and Forests ministries jointly issued general advisories to prevent train accidents involving elephants. The advisories included measures like clearance or vegetation alongside the tracks, sensitising programmes for train drivers, guards, keeping the track free from food wastes and engagement of elephant trackers.
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The audit team checked the extent of implementation of above measures in three zones - South Eastern (SE), Southern and North Eastern Frontier (NEF) - where rate of animal mortality was high.
It has found in SE zone that neither any sensitising programme was being conducted nor any action was taken for engagement of elephant trackers. Besides no specific clause was incorporated in the agreements with IRCTC for proper disposal of wastes in order to keep rail tracks free from food wastes.
The measures as mentioned in the general advisories were implemented in NEF zone except the construction of forest underpasses across tracks which were under progress.
Southern zone had taken a number of preventive measures like imposition of speed restriction, provision of warning boards, regular clearing of vegetation on sides of track for better visibility.
According to the CAG, Railways had stated that the long term measures to prevent such mishaps were under scrutiny.