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Coal ash (or cinder) is used in initial stages of a new construction of railway for __________

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Coal ash (or cinder) is used in initial stages of a new construction of railway for __________

(a) wooden sleepers

(b) steel sleepers

(c) cast iron sleepers

(d) iron sleepers

I have been asked this question in an interview.

The question is from Dealing with Railways in division P.W.D of Civil Engineering Drawing

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Best answer
Correct option is (a) wooden sleepers

For explanation I would say: For preventing of wooden sleepers from termite and fungus.

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