If the IBS is defective and advanced starter is working, SM shall issue ________ authority with private number of next station to pass IBS. A. T/369(3b) B. T/369(2B) C. T/369(4b) D. T/369(5b)

The correct answer is A. T/369(3b).

T/369(3b) is the authority that allows a train to pass an IBS that is defective. The authority must be issued by the SM (Station Master) and must include the private number of the next station to pass the IBS.

T/369(2B) is the authority that allows a train to pass an IBS that is working. This authority does not require a private number to be included.

T/369(4b) is the authority that allows a train to pass an IBS that is working and has a speed restriction. This authority requires the speed restriction to be included in

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