Four official surveys were made in 1922 , 1936 , 1942 and as recently as 2008 , but the plan failed to take off due to the concerns of railway line passing through the Sathyamangalam Wildlife Sanctuary .
Four official surveys were made in 1922 , 1936 , 1942 and as recently as 2008 . 
 The plan failed to take off due to the concerns of railway line passing through the Sathyamangalam Wildlife Sanctuary .