Page 285 - IRSEM_Main Book

12.2.4 Branching Off: Where practicable, rods in a main run shall be arranged so
that they branch off on the track side in regular order.
12.2.5 Rodding Running Under Track: When practicable, rodding running under
tracks shall be arranged to permit the standard spacing and packing of
sleepers. The top of the rodding shall not be less than 25 mm below the
bottom of the rails. Whenever possible, the running of rods under rail joints
shall be avoided.

12.2.6 Fixing Roller Standard:The top of roller standards adjacent to tracks shall
not be fixed more than 64 mm above rail level.

12.2.7 Spacing of Rollers: Runs of rodding shall be supported on rollers spaced not
more than 2.2 metre apart for solid rodding and 1.85 metre apart for tubular
rodding. On curves the distance apart shall be 1.85 metre for both types.

12.2.8 Offsets in Roddings: Offsets in rodding shall be limited, wherever possible
to 60 mm. Offsets of 90 mm may, however, be made where solid rodding is
used. The minimum length of the offset shall not be less than twice the
amount of the offset. Where more than one offset is necessary, a guide shall
be provided. When making offsets in joints, the pin shall be kept in place to
keep the pin holes true.

Section 3: Point Operation in Mechanical Signalling

12.3.1 Essential requirements before Interlocking of a Point: Before any newly
laid point is connected to the lever frame or a point machine and interlocked,
it shall be ensured that the SSE/JE (P-Way) has taken necessary steps as
detailed in Annexure:12-A1.
12.3.2 Adjustment of Point Switches: Point switches and switch and lock
movements shall be so adjusted that the lever operating them is sprung
equally in the normal and reverse positions. This springing shall normally be
12 mm on the lever quadrant.

12.3.3 Permissible Distances: The distance at which Points may be worked by
rodding must not exceed 320 meters except where the stroke at the lever tail
is not less than 200 mm, in which case the above distance may be increased
to 460 meters. For special type of switches, the Chief Signal and
Telecommunication Engineer may stipulate the permissible distance.
Section 4: Facing Point Locks, Switch & Lock Movements

and Spring Point Levers

12.4.1 Layout

(a) Facing Point layouts shall be installed in accordance with approved plans.

(b) Facing Point lock shall be fitted on the gauge tie plate where steel
sleepers are not provided.

(c) A key lock shall be so placed as to be inaccessible during the passage of
a train unless the arrangement is such that a key is used to release the
signals and cannot be brought back to the points until such signals have
been put to the 'ON' position.

Chapter 12: Installation, Testing & Maintenance of Mechanical Signalling Equipment Page 239 of 535