IR's bell code has some points of correspondence with systems used in the UK in the early part of the 20th century. The system of bell codes to convey messages from one signalbox to another is given below. An 'X' indicates a short strike on the bell, and a dash indicates a pause.
| Message | Code |
|---|---|
| Attention | X |
| Line Clear Inquiry | XX |
| Train entering Block Section | XXX |
| Train leaving Block Section, Obstruction removed | XXXX |
| Cancel previous, Cancel last (given in error) | XXXXX |
| Danger or Obstruction | XXXXXX |
| Stop and Examine Train | XXXXXX-X |
| Train passed without tail lamp or missing tail board | XXXXXX-XX |
| Train Divided | XXXXXX-XXX |
| Runaway Vehicle (single line, or double line wrong direction) | XXXXXX-XXXX |
| Runaway Vehicle (double line, right direction) | XXXXXX-XXXXX |
| Instrument test | XXXXXXXXXXXXXXXX (16 beats) |
The acknowledgement for each of these messages is given by repeating the same message immediately.
Source - IFRCA.org
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