Question:
Which of the following is NOT a part of the typical speed-time curve for train movement?
Which of the following is NOT a part of the typical speed-time curve for train movement?
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Train motion = acceleration → constant speed → coasting → braking. Free fall? Not in railways!
Updated On: Jun 24, 2025
- Acceleration
- Coasting
- Constant braking
- Free fall
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The Correct Option is D
Solution and Explanation
Step 1: Understand the speed-time curve for trains
Typical segments of a speed-time curve include:
- Acceleration: Speed increases from rest.
- Constant speed: Train runs uniformly.
- Coasting: Power is cut off, train moves with decreasing speed.
- Braking: Deceleration begins till it stops.
Step 2: Free fall doesn't occur in train systems
"Free fall" refers to motion under gravity without resistance — not applicable in rail systems.
Conclusion:
Option (4) "Free fall" is NOT a part of train motion profile → correct answer.
Typical segments of a speed-time curve include:
- Acceleration: Speed increases from rest.
- Constant speed: Train runs uniformly.
- Coasting: Power is cut off, train moves with decreasing speed.
- Braking: Deceleration begins till it stops.
Step 2: Free fall doesn't occur in train systems
"Free fall" refers to motion under gravity without resistance — not applicable in rail systems.
Conclusion:
Option (4) "Free fall" is NOT a part of train motion profile → correct answer.
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