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Q: Maximum allowable grades are lower for railways than for highways. the reason is:
  • A. Steel wheel on steel rails have lower frictional co-efficient than rubber tyres on pavements
  • B. High grade causes discomfort to passengers
  • C. Steel wheel on steel rails have greater frictional co-efficient than rubber tyres on pavements
  • D. Trains are longer than vehicles on highways
Correct Answer: Option A - Maximum allowable grades are lower for railway than for highways because construction costs become prohibitive for railways at high grades and Steel wheel on steel rails have lower frictional co-efficient than rubber tyres on pavements.
A. Maximum allowable grades are lower for railway than for highways because construction costs become prohibitive for railways at high grades and Steel wheel on steel rails have lower frictional co-efficient than rubber tyres on pavements.

Explanations:

Maximum allowable grades are lower for railway than for highways because construction costs become prohibitive for railways at high grades and Steel wheel on steel rails have lower frictional co-efficient than rubber tyres on pavements.