CHAPTER XXI

RELAY AND ELECTRONIC INTERLOCKING

. A RELAY INTERLOCKING
21.1 General Requirement
21.2 Control Panel
21.3 Control Panel Indication
21.4 Interlocking & circuit requirements
21.5 Route Release Circuits
21.6 Signal control circuits
21.7 Interlocking of level crossing gates
21.8 Point interlocking & control circuits
21.9 Cross protection
21.10 Relays
21.11 Signals
21.12 Points
21.13 Track circuits
21.14 Cables
21.15 Wiring & Relay racks
21.16 Fuses, terminals & Terminal links
21.17 Power supply arrangements
21.18 General
. B ELECTRONIC INTERLOCKING
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