Page 306 - IRSEM_Main Book

12.25.4 Interlocking Frame

(a) Instructions for working of Traffic during overhauling: When a lever frame,
Station Master's control frame or interlocked key box or any other interlocking
frame is being overhauled, the station shall be worked in accordance with
special instructions issued by each Railway to ensure full compliance with
G.R.3.38 and 3.39 and the Station Master shall be responsible for ensuring
that all the facing points over which the train will pass, are correctly set,
clamped and padlocked and that all trailing points over which the train will
pass are correctly set before taking 'OFF' signals. The manner in which
Station Master will ensure this shall be clearly laid down. Detailed temporary
working instructions shall be prepared for every station by the DSO for each
phase of the work in consultation with concerned DSTE and supplied to the
station before overhauling is commenced.

(b) A notification showing the date and time when the overhauling work would be
taken in hand, its probable duration and instructions for the station Master to
issue Caution Order to Loco pilots and for Loco Inspector to advise Loco
pilots to observe the temporary speed restriction shall be issued jointly by the
Sr.DSTE/DSTE and the DSO.

(c) For the portion of the yard, which is controlled by the Cabin to be
overhauled

(i) Before undertaking overhauling work wherever required, suitable
communication facilities shall be provided.

(ii) The Loco pilots shall be issued a Caution order at the last stopping
station instructing him/her of the speed restriction of 30 Km/h at the
station where overhauling of interlocking frame is in progress.

(iii) Special instructions for reception/dispatch of trains and shunting
operations, if any, should be drawn keeping in view GR & SR 15.09
(2) and annexed to the notification referred to in para 12.25.4(a).

(iv) Distant/warner signal and main home signal proceed aspect shall be
made inoperative. Distant/warner signal shall be kept at 'ON' position
and first auto signal in automatic block sections to be kept inoperative
for ‘Attention’ and ‘Proceed’ aspects.

(v) Wherever work is required to be done during night hours, adequate
lighting arrangements shall be provided.

(vi) Section of the track, on which caution order is to be imposed, must be
specified.

(d) Only after the Station Master on duty has assured himself that the line
has been correctly set and facing points locked for the required
movement, he may permit the signals to be taken 'OFF' for the reception
or dispatch of a train.

Chapter 12: Installation, Testing & Maintenance of Mechanical Signalling Equipment Page 260 of 535