Page 425 - IRSEM_Main Book

18.12.4 IBS in Double Line

(a) IBS should be interlocked with any of the approved means of block
working for Double line.

(b) IBS shall not be taken off for Train unless line clear has been obtained
from Block Station in advance.

(c) DLBIs/Block Panel of BPAC etc. pertaining to the monitoring of advance
section are placed at the rear and advance stations.

18.12.5 IBS in Single Line

(a) Provision shall be there, to establish the direction of traffic for IBS in single
line.

(b) First direction of traffic shall be established and then line clear shall be
obtained from the Block station in advance as per the established direction
of traffic. Only after establishing the direction of traffic the train movement
in the station controlled intermediate block section shall be permitted.

(c) IBS shall not be taken off unless the line clear has been obtained from
Block Station in advance and direction of traffic is established.

(d) IBS should be interlocked with any of the approved means of block working
for Single line.

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General Note: (1) IB Signal shall be located in such a way, to split the block section
into near halves subject to other criteria. IB Signal shall not be provided in a Block
section with steep falling gradients, unless the brake power is adequate to enable the
trains being stopped at IB signal.

(2) One of the methods of providing IB signals using OFC (optical fiber cable) and
Multi Section Digital Axle Counter (MSDAC) is given at Annexure: 18-A4 as an example
for guidance only.

Note: This Chapter has under mentioned Annexures
S.No. Annexure No. Description

1 18-A1 Painting Scheme - Block Signalling Equipment

2 18-A2 Tokens Lost/Tablets Lost
3 18-A3 Token Balance Book

4 18-A4 Intermediate Block Signalling (using OFC, MSDAC)

Chapter 18: Block Instruments, BPAC & IBS Working Page 373 of 535