The principal function of ballast in a railway track is to:
Correct answer: C. Distribute sleeper loads and provide drainage
- A. Join two rail ends with a fishplate
- B. Provide electrical power to signalling equipment
- C. Distribute sleeper loads and provide drainage
- D. Maintain the exact length of each rail
Explanation
Ballast distributes loads from sleepers to the formation, provides drainage, and helps maintain track alignment. Fishplates join rails, while signalling equipment is not the primary purpose of ballast.
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Transportation engineering covers highway planning and alignment, traffic studies, road geometric design, pavement materials and flexible or rigid pavement construction. It also includes railway, airport and traffic engineering concepts such as sight distance, superelevation, signals, capacity and level of service, distinguishing pavement failure from poor geometric design.
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