| . |
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 |
| . |
(Section left blank) |