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

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

July 16, 2019, 12:51 PM

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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