(1) Each signal received shall be acknowledged by sending its authorised code
(2) No signal shall be acknowledged unless clearly understood.
(3) A signal shall not be deemed to be completed until it is acknowledged.
(4) If the station to which signal is sent does not reply, the signal shall be repeated at intervals of not less than twenty seconds until reply is received.
(5) In case of emergency danger signal is being received it must be immediately reacted upon by the Station Master on duty.
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