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AN INTRODUCTION TO - page 19 / 72

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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 signal box to another is given below. An 'X' indicates a short strike on the bell, and a dash indicates a pause.

Bell Codes 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.

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