23.IBS

IB Signal -

IBS is an arrangement made for increasing the section capacity by splitting of a relatively long block section into two portions namely Rear Section and Advance Section by placement of IBS at  near mid of two block sections.

IB is used where distance between two block sections is equal or more than 10 kms.MSDAC is possible in IB Section.

IB signal should not be placed if Gradient is steeper than 1:80.

 In case of IB signal, Separate set of ATs shall be provided,with automatic Changeover switch.

Rear Section i.e. " Station Controlled Intermediate Block Section" starts from LSS of rear station and ends at IBS including 400 m block overlap in that direction.

Advance section i.e. " Block Controlled Intermediate Block Section" starts from IBS and ends at Home Signal of Advance Station including block overlap in that direction.

Track sections in both Rear and Advance Section are monitored either by Axle counter or Track Circuit.

Train entry into Rear Section is controlled by LSS of rear station in that direction.

Train entry into Advance Section is controlled by IBS in that direction.

IBS block overlap of 400 m shall be seperately monitored.

Provision must be there to indicate that train has passed IBS at ON position.

Control of IBS lies with SM of station in rear.

A signal post telephone( SPT) or any approved type communication shall be provided with station in rear.

Resetting Operations in IBS-

Two types of resetting Operations 

a) When a train passes IBS at ON position/ blank

b) When Axle counter fails. (PB 2 and PB 3 push buttons are used)

IBS system will permit only one train in the entire block section, when a train passes IBS at ON position or axle counter is not clear even after passage of train beyond axle counter section.

Procedure to be followed by Loco pilot to pass IBS at ON as per GR 3.75

a) If phone communication is available between IBS and rear section - Loco pilot shall stop his train in rear of IBS and contact SM of rear station on SPT, then pass the defective IBS,if authorised by SM.

b) If phone communication is not  available between IBS and rear section - Loco pilot after waiting 5 min, can pass IBS at danger at a speed not more than 20 kmps. He shall be able to reduce speed to 8 Kmph in case of inadequate visibility.

Loco pilot will maintain restricted speed till he reaches advance station.

IBS in Double Line 

1) IBS should be Interlocked with any of the approved means of block working for double line.

2) IBS should not be taken off unless line clear has been obtained from block station in advance.

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

IBS in Single Line 

1) Provision shall be there to establish direction of trafic for IBS in single line.

2) First direction of trafic shall be established and then line clear shall be obtained from Block station in Advance as per the established direction of trafic.

3) IBS shall not be taken off unless the line clear has been obtained from block section in Advance and direction of traffic is established.

4) IBS should be Interlocked with any of the approved means of block working for single line.

Note - IBS 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.

Boundaries of Track Section 

(I) AS track section, which starts from the foot of LSS and ends at 400 m ahead of IB home signal.

(II) IB track section,from the foot of the IB home signal to 400 m ahead of the IB signal.

(III) BPAC section, from foot of the IB home signal to 180 m ahead of home signal of Advance Station.

In IBS with HASSDAC, the Axle Counter Evaluator equipment for second block section is provided at both the ends.

IB telephone is connected to rear station only.

IB is classified as class C station.

While passing IB signal at night ,speed must not be more than 8 kmph.

GR 3.75 - Procedure to be followed by Loco pilot to pass IBS  at ON 

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