Letter No. Date Description Policy No. Hyp.No. No.2000/Tele/TN/3 05/09/2003 Provision of BSNL/MTNL telephones at stations.   TS-04 No.88/Tele/TN/1 PES/ Vol. II 20/06/1991 Standardisation of 3 digit/4 digit DOT enquiry telephones at Railway stations all over Indian Railways.   TS-03 No. 67/W3/TN/32 06/09/1969 Provision of telephone at Railway Stations.   TS-02 No. 67/W3/TN/32              No. 58/W3/TN/13 19/02/1968 24/06/1958 Provision of Telephones at Railway Stations.   TS-01  No. 93/Tele/TN/5/TES  22/03/2004  Accessibility of Railway Enquiry Services (131,132,133 ....) on NSD network  RB Tele 6/2004  TS-05