I recently travelled on Koyna Express from Pune to Sangli and wanted to see the Horseshoe turn at Adarki. Fortunately two of my fellow travellers turned out to be Engine Drivers. They told me that the original 180 degree bend is no longer in use as there is now a tunnel dug. Would anyone throw light on when the tunnel was dug? Other historical details of the original bend are also welcome.
Thanks.