Page 353 - IRSEM_Main Book

(b) Approach Locking in Automatic Block Signalling/Suburban Sections

(i) Both Approach locking and back-locking shall be provided by track
circuits/Axle Counters on the interlocked level crossings situated on
sections provided with automatic signalling.

(ii) The approach locking shall be effective from the moment the train
occupies the track circuit in rear of the signal, which has assumed,
‘OFF’ position when the Gate Signal is taken 'OFF' and the back
locking shall be effective until the train clears the level crossing. The
audible warning (for Road Users) shall stop as soon as gate is closed
and locked but ‘stop’ aspect (for road users, where provided) shall
continue to be displayed till the gates are re-opened for traffic.

(iii) Approach locking should be effective from a distance not less than
emergency braking distance required for maximum permissible speed
on that section.

14.1.10 Emergency Provisions Due to Failures

(a) Level Crossing Gate Unable to Close

(i) Emergency Sliding Booms shall be provided at all interlocked gates to
work trains on signals in case of failure of lifting barrier.

(ii) Fixing of Emergency Sliding Boom shall be outside lifting barrier to
ensure safety of road users & trains. Painting scheme of sliding boom
shall be same as lifting barrier.

(iii) Stop indicator Board (Retro reflective type) shall be provided on
Emergency Sliding Booms. Also road signal, if provided shall display
ON aspect to avoid confusion to road traffic.

(iv) Normal aspects of signals as per interlocking may be provided during
use of Sliding Boom Barrier with following arrangements:

 Sliding Boom should be directly locked by ‘E’ type lock or by any
suitable means.

 E-type locks of same ward (matching with working lifting barrier)
should not be used in sliding boom type.

(b) Level Crossing Gate Unable to Open

(i) An Emergency key shall be provided at the gate lodge at all interlocked
gates and shall be kept in "EKT sealed box with pad lock", to enable
Gate man to open the gate and allow road traffic in case of failure of
lifting barrier to open.

(ii) Counter should be provided for logging gate man’s extraction of
emergency key to open LC gate.

(iii) Record of use of emergency key shall be maintained in a register with
reason.

Chapter 14: LC Gates Page 304 of 535