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AN INTRODUCTION TO - page 18 / 72

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turned to the middle position i.e. the Line Closed position. Now the Block Instruments are ready for another train.

A similar procedure is observed while sending a train from Valsad to Dungri over the Down Line. Although the block instruments are combined for the Up and Down line, these lines are discrete and simultaneous movements can be conducted over both these lines without restrictions.

However, in case of emergencies, single line working can also be started on double line sections. Detailed procedures are laid out for such situations which are beyond the scope of this paper. However, in such situations, the Block Instruments may be kept suspended.

Conditions which must be satisfied for giving Line Clear:

The above paragraphs have mentioned that the Line Clear is simply given but in fact before a Line Clear is given the following conditions must be satisfied:

  • 1)

    Previous train must have arrived completely.

  • 2)

    Home signal at Valsad must be lit and at Danger. (Once Line Clear has been given,

the Home can be taken Off).

3) Block Overlap of 180 meters must be clear of any obstructions at “B” Class stations and up to the Advance Starter at “C”class stations.

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