Overlap,Adeqate distance ,fouling mark

 Block overlap  SEM .7.1.8-.  180 meter - Adequate distance ahead home signal only ( used for line clear)                     

Signal overlap SEM 7.1.9. -120 meter- Adequate Distance ahead starter signals only if we are lowering Home Signal to receive a train.

IB signal overlap -400 meter

No Block overlap in  Automatic Block system.Only signal overlap 

Automatic signalling possible in singal line but it is rare.

Adequate distance- distance to ensure safety 

Block overlap and signal overlap are two types of Adequate distance 

Fouling mark -

Fouling means the marks at which the infringement of two fixed standard Dimensions Fouling Block  occurs,where two lines crosses or join each other. 

It shall be placed at a location,where centre to centre distance :-

Minimum 4265 mm ( for existing line)

Minimum 5300 mm ( for New construction)

Glued joint should be placed more than 3m distance from Fouling mark to avoid side collision because in guard compartment the distance between wheel and last part of vehicle is around 3m.



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