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Section 24: Overhauling and Testing of Interlocking
Mechanical/Electromechanical

12.24.1 Interlocking Frames

(a) All interlocking frames, interlocking key boxes and Station Master's Slide
Control frames shall be overhauled once in three years and tested
periodically once in a year. The records of the same shall be maintained.

(b) The Electromechanical Frames shall be overhauled and tested
periodically as per requirement contained in the above para.

12.24.2 System and Equipment Testing

(a) Relay interlocking and Electronic interlocking installations shall be tested
as indicated in SEM Chapter 21.

(b) Periodical testing and overhauling of mechanical signalling equipment
used in signalling installations shall be done as per requirements
contained in para 12.25.5 & 12.26.7.

Section 25: Overhauling of Interlocking Frames, Interlocking

Key Boxes and Station Master's Slide Control Frames
12.25.1 Periodicity

(a) All interlocking frames, interlocking key boxes and Station Master's Slide
Control frames shall be overhauled once in every three years or earlier, if
necessary.

12.25.2 Programme of Overhauling

(a) The Sr. DSTE/DSTE shall draw out a programme of overhauling of
interlocking frames, interlocking key boxes and Station Master’s slide
control frames on the Division on a monthly basis spread preferably over
the first 9 months of a calendar year. Any overhauling work that may fall
into arrears due to unforeseen circumstances shall be completed during
the remaining three months.
(b) The programme shall indicate

(i) Particulars of Interlocking Frames, Interlocking Key Boxes and Station
Master’s slide control frames to be overhauled month by month;

(ii) Dates of last overhauling.
(c) A Copy of the programme shall be supplied to each SSE/JE (Signal)
incharge who has to carry out the overhauling accordingly.

12.25.3 Requirement of Materials for Overhauling

(a) The Supervisory SSE/JE (Signal)/incharge shall check before undertaking
the work that the material needed for overhauling of interlocking frames,
interlocking key boxes and Station Master's slide control frames is
available. If not, he shall requisition the same sufficiently in advance so
that it is available for the work in time.

Chapter 12: Installation, Testing & Maintenance of Mechanical Signalling Equipment Page 259 of 535