Among the sand dunes of the unforgiving Thar desert live families in limbo, divided by the barbed wire of the Indo-Pak border. They wait for the lost train to Pakistan in the hope that it will re-unite them with those on the other side of the political horizon. Shikha Trivedy travelled to Munabao in Rajasthan, the train's last Indian stop, and listened to the voices of the Thar speak of loss and longing.