alleryWhat extra rail helps a railway climb a very steep slope?
ASmooth glass rail
BWooden roller rail
CToothed rack rail
DPlain spring rail
Answer & Solution
Correct answer: C. Toothed rack rail
1. Steep slopes make wheels slip on smooth rails.
2. A toothed rack rail gives the train extra grip for traction.
3. The other rails named do not give grip on a slope.
_Source: Wikipedia, Transport, section Rail_
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