Speed-time curve of main line service differs from those of urban and suburban services on following account_______________?
Correct answer: D. all of the above
- A. it has longer free running period
- B. it has longer coasting period
- C. accelerating and braking periods are comparatively smaller
- D. all of the above
Explanation
Main-line trains travel longer distances between stations, so their speed-time curves have longer free-running and coasting intervals; their acceleration and braking intervals are relatively shorter. Thus all the listed differences apply.
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