In earlier days, the Railway telegraph system was maintained by the Posts and Telegraphs Department. An Engineering Supervisor, Telegraphs (EST) will be in charge of these telegraph lines which is installed along the rail tracks and was used to communicate between the stations, control room etc. Telegraph Linemen were posted to maintain and remove the faults of these lines, which was most essential for the regular running of the trains. The Telegraph Linemen were allotted quarters by the Railways and they were treated as on 24 hours duty. He was ‘VIP'(Very Important Person) indeed!
Every morning, these linemen will call the Fault Control or the Carrier station and find out whether any fault has been reported and also to get the lines tested. It was a very tedious job for them. In the Railways Junctions, the telegraph posts were full of many wire lines, which only very experts can identify and repair. The Sub Inspector (SI) Telegraphs or the Line Inspector (LI) Telegraphs will give guidance to the Linemen in such circumstances.
Later, the Railway telegraph lines were handed over to Railways and the responsibility of maintaining and repair also went to them. Gradually, the overhead lines mostly changed to cables. Now latest technologies are used for the Railways.