Remote Control & Communication Arrangements — Traction Distribution Notes

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Interrupters at switching stations and feeder circuit breakers at substations are controlled from a Remote Control Centre (RCC), manned 24 hours a day. All switching operations on the system are under the control of ONE single person — the Traction Power Controller (TPC) — who is responsible for maintaining continuity of power supply across all OHE sections and maintains close liaison with Section Controllers regarding train operation.

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Exam Focus — TPC Is a Single Point of Control

This directly reinforces the decision-making authority we saw in the Breakdown Management chapter — TPC alone controls ALL switching operations, which is exactly why TPC (not any other officer) decides whether to block only electric traffic, permit restricted-speed coasting, or fully close a line during a breakdown.

Communication Facilities — Real Infrastructure

All aerial telecommunication lines running alongside tracks are replaced with underground cables/microwave/optical fibre cables specifically to overcome interference caused by 25kV single-phase AC traction. In an electrified section, several INDEPENDENT telephone circuits are maintained — so if one fails, alternate channels remain available for emergency communication.

The 9 Real Telephone/Communication Circuits

Train Control/Section Control — operated by the Section Controller for train movements within jurisdiction. Connects Signal Cabins, ASMs' offices, Loco Sheds, Yard Masters' offices.
Dy. Control Telephone — operated by the Deputy Controller for general traffic direction. Connects important Station Masters' offices, Yard Masters' offices, Loco Sheds, Signal Cabins.
Stock Control Telephone — operated by the Stock Controller, mainly for watching/controlling wagon movements. Connects Yard Masters and important Station Masters' offices.
Traction Loco Control — a circuit specific to AC traction, operated by the Traction Loco Controller, responsible for electric loco/EMU movements. Connects EMU Sheds, important Station Masters, Yards, Divisional Officers (Sr.DEE/DEE, AEE-RS, Sr.DEE/DEE/AEE-OP), Traffic Control Offices, Traction Foreman (SSE), and important crew booking points.
Traction Power Control — used by TPC for all power-switching-operation and Permit-to-Work communication. Connects Station Masters' offices, cabins, traction sub-stations, feeding posts, sectioning/sub-sectioning posts, traction maintenance depots, important Signal Cabins, Divisional Officers, Traffic Control Offices.
Emergency Control Circuit — operated by TPC, located in the RCC, for maintenance gangs/train crew to reach TPC with minimum delay in emergencies. Emergency telephone socket boxes are provided along the track at 0.75-1 km intervals, plus near signal cabins, sub-sectioning/sectioning posts, insulated overlaps, and feeding posts.
Hot Line Communication — between HQ, divisional HQ, traction loco controller, and electric loco sheds. Connects CEE/CEE-Loco/Dy.CEE-RS/Sr.DEE-RS at HQ level, Sr.DEE/OP at division level.
Walkie-Talkie sets — kept at every OHE maintenance depot for on-site communication during maintenance/breakdowns, used to: (a) confirm power block sanctioned, (b) direct/supervise work during the block, (c) confirm cancellation of power block by each party.
Other Communication facilities — an independent inter-communication circuit between Section Controllers and the Chief Controller for local coordination.

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Exam Focus — Who Can Actually Ring Whom

A subtle but genuinely real restriction: the Chief Controller and TPC CAN talk to any station on the train control/traction loco control circuits when needed (including emergencies for TPC) — but neither of them can independently RING any station on any control circuit. That ringing facility is reserved only for the respective Controllers (Section Controller, Deputy Controller, etc.) who normally operate that specific circuit.