All Communication Failure on Single line (SR 6.02 – 4)
1. In the event of total interruption of communication (TIC) occurring between two stations on a single line section, i.e. when Line Clear cannot be obtained by any one of the following means stated in order of preference viz:
a. Block instruments; Track circuits or Axle counters;
b. Telephones attached to the Block Instruments;
c. Station to station fixed telephones wherever available;
d. Fixed telephone such as Railway auto phones & BSNL / MTNL phones;
e. Control Telephone;
f. VHF sets under special instructions, but not as the sole means of communication on sections where passenger trains run.