Page 299 - IRSEM_Main Book

(c) Lockbar shall not be installed over a check rail portion as a matter of
course. Under special circumstances and only if other electrical means
cannot be provided, Lockbars can be installed over check rail portion
when they are fitted with a special type of check rail joint.

(d) Lockbars shall preferably be installed on the rail associated with straight track.

12.15.4 Lockbar General

(a) Lockbars shall be kept straight and true both vertically and horizontally,
driving pieces shall be examined to see if there is any lost motion.

(b) Lockbar clips, stops and guides shall be tightly attached to the rails. Arms
and pins of clips shall be kept in good order so as to ensure that the
Lockbars fit close up to the rail. Bearings of clips shall be kept well oiled.
Lockbar clips shall not be bent to prevent leaning away. Care shall be
taken to ensure that there is adequate clearance between clip hanger and
the top studs when fully tightened so as to permit easy working.

(c) All Lockbars, clips, stops and guides shall be overhauled and thoroughly
cleaned at least once a year. Renewals shall be made where necessary.

(d) If rail creep is affecting the working of Lockbars, Technician shall make a
report in writing to the SSE/JE (P-Way), giving copy to the SSE/JE (Signal).

12.15.5 Testing Lockbars: Lockbars shall be tested to see that with the operating
lever normal or reverse-

(a) Outside Lockbars lie practically level with the top of the rail;

(b) Inside Lockbars lie 38 mm below the top of the rail. They shall lie flush
with the top of the rail when the lever is in the mid-stroke.

Section 16: Maintenance of Mechanical Detectors

12.16.1 All detectors shall be examined regularly and the slides kept well lubricated.

12.16.2 Detector notches: Detector notches shall be kept square and not eased
beyond the standard size. Notches in point slides shall be kept properly
adjusted.

12.16.3 Cleaning of detector shoes and angle slides: Detector shoes and their
angle slides should be regularly cleaned and graphited to permit free
movement of the detector shoe.

12.16.4 Testing of detectors: Detectors shall be regularly tested by obstruction test
with a test piece of 5 mm thickness placed between the switch and stock rail
at 150 mm from the toe, with the obstruction in, the signal slide shall get
obstructed.

12.16.5 Replacement of cracked or broken parts: Cracked or broken parts of
detectors shall be repaired or renewed.

Chapter 12: Installation, Testing & Maintenance of Mechanical Signalling Equipment Page 253 of 535