The One Train Only system
(Extract from IR General Rules : Chapter 13)
13.01 Use of the One Train Only System.
Trains may be worked on the One Train Only System, only on
short terminal branches on the single line.
13.02 Essentials of the One Train Only System. Where trains are
worked on the One Train Only System, only one train shall be on the
section on which this system is in force, at one and the same time.
13.03 Authority to enter the section
A Driver shall not take his train into the section unless he is
in possession of the authority to proceed as prescribed by
13.04 Procedure in case of accident or disablement on the One Train
(1) (a) If the train becomes disabled and requires assistance
or if an accident occurs which renders it impossible for the
train to proceed, the train shall be protected in accordance
with the provisions of Rule 6.03 in the direction from which
assistance, if necessary, is being obtained.
(b) The Guard of the train shall convey advice of the
circumstances under which the train has become disabled and is
not able to proceed, to the Station Master of the station from
which assistance can best be obtained, and if it is necessary
for such Guard to proceed to such station, he shall instruct
the Driver in writing to keep the train stationary until his
return, and obtain his written acknowledgement.
(2) (a) Such Station Master, if he is not the Station Master of
the base station, shall communicate this information to the
Station Master of the base station. On receipt of such
information, the Station Master of the base station may allow
another engine to enter the line.
(b) The engine so sent shall either be accompanied by the
Guard of the disabled train, who shall explain to the
Driver where and under what circumstances the disabled
train is situated, or the Driver of the Engine so sent
shall be given a written authority, containing such
instructions as to where and under what circumstances the
disabled train is situated and such other particulars as
may be necessary to enter the line unaccompanied by the
Guard of the disabled train.
(3) The Guard of the disabled train shall be responsible for
the safe and proper working of the line until the disabled
train has been moved and any other engine sent to the
assistance of the disabled train has been returned to the base
(4) If there is no Guard of a disabled train, the Fireman or
the Assistant Driver or, if necessary, the Driver shall perform
the duties imposed by this rule on the Guard, provided that the
engine is not left unmanned in terms of Rule 4.20.