Page 308 - IRSEM_Main Book

(j) Locking shall be refitted carefully. Before replacing the covers, the locking
shall be again powdered with graphite. Thin mineral oil shall be used for
lubrication when graphite is found unsuitable owing to climatic conditions.

(k) It shall be ensured that waste cotton pieces or any other foreign materials
are not left inside the locking boxes.

(l) Before replacing the covers, the locking shall be carefully checked with
the approved locking diagram.

12.25.6 Resumption of normal working

(a) It will be personal responsibility of the Supervisory SSE/JE (Signal) to test
all interlocking frames up to 20 working levers after completion of
overhauling and to introduce normal working. As regards interlocking
frames with 21 to 30 working levers, normal working can be introduced
after completion of overhauling and testing of interlocking by the
Supervisory SSE/JE (Signal). The DSTE/ADSTE must, however test the
locking as soon as possible after normal working has been resumed by
the Supervisory SSE/JE (Signal).

(b) When the lever frame to be overhauled is more than 20 working levers, as
soon as the overhauling work has been completed, it will be the personal
responsibility of the SSE/JE(Signal)/incharge to intimate the Signal Officer
concerned that the interlocking frame is ready for his test.

(c) In regard to interlocking frames with more than 30 working levers, it will be
the personal responsibility of the Signal Officer concerned to test all such
interlocking frames after completion of overhauling and to introduce
normal working.

(d) The testing referred to in para 12.26.7 shall be carried out as per
approved locking table.

(e) The Sr.DSTE/DSTE/ADSTE must keep in close touch with the progress of
the overhauling work and see that the duration of the work is reduced to
what is actually necessary to avoid undue continuance of the restrictions
imposed on the traffic working.

12.25.7 Overhauling of Interlocking Key Boxes

(a) Interlocking Key Boxes must be overhauled under the personal
supervision of the SSE/JE(Signal)/incharge.

(b) Disconnection Memo on Form S&T/DN (Annexure: 3-A10) shall be issued
by the SSE/JE (Signal) to the Station Master on duty and his signature
obtained before starting and reconnection memo issued after completion
of the overhauling work.

(c) The responsibility for the safe custody of the interlocking keys released
from the interlocking key box as long as the locking is disconnected shall
rest with the SSE/JE (Signal)/incharge.

Chapter 12: Installation, Testing & Maintenance of Mechanical Signalling Equipment Page 262 of 535