Quadrilateral speed-time curve pertains to which of the following services ?
Correct answer: D. Urban and sub-urban service
- A. Main line service
- B. Urban service
- C. Sub-urban service
- D. Urban and sub-urban service
Explanation
The quadrilateral speed-time curve is used for urban and suburban services, where stops are relatively close and the train may have acceleration, constant-speed, coasting and braking periods. Main-line service is more commonly represented by a trapezoidal curve.
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