సింగరేణి కాలరీలు - సింగరేణి ఎక్సప్రస్ రైల్
A Special cover was released on 02 Sep 1976 to mark the Inaugural run of Singareni Express Train . The Cover was cancelled at Belampalli PO . This train covers all Coal Mining Towns of Andhra Pradesh. The Cover also shows the Singareni Collieries .
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