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What is the bell code used to communicate between signal cabins for block working?

July 16, 2019, 12:51 PM
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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 signalbox 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.

Source – IFRCA.org

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