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Free running and Coasting in Main line service?
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Less
Both a and b
None of above
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In main line service, the distance between stations is very large, which necessitates longer periods of free running and coasting to achieve energy efficiency. Consequently, the duration and distance covered under free running and coasting conditions are significantly more than in suburban or urban service.
In main line service, the distance between stations is very large, which necessitates longer periods of free running and coasting to achieve energy efficiency. Consequently, the duration and distance covered under free running and coasting conditions are significantly more than in suburban or urban service.
E=тИлPdt тАФ Energy consumption relates to the duration of power-on (acceleration and free running).
vcтАЛ=v0тАЛтИТWFtтАЛтАЛt тАФ Deceleration during coasting due to tractive resistance.
The speed-time curve of a train consists of acceleration, free running, coasting, and braking. In main line service, because the distance between stations is large, the train accelerates to a constant speed (free running), then cuts off power to coast due to momentum, and finally applies brakes. This minimizes energy consumption by utilizing the kinetic energy stored in the train.
Main line services have large distances between stops, making coasting critical for energy conservation.
Free running allows the train to maintain constant speed, reducing the required peak power.
The duration of coasting increases as the distance between stations increases.
Reduces total energy consumption by utilizing stored kinetic energy.
Reduces wear and tear on mechanical braking systems.
Increases the total travel time between stations.
Requires precise calculation of coasting points to ensure the train reaches the station on time.
Long-distance inter-city railway transport.
Main line electric traction systems.
In suburban service, acceleration and braking dominate the speed-time curve, whereas free running and coasting are dominant in main line service.
Option B (Less) is incorrect as it describes short-haul urban transit, not main line operations.
A is correct тАФ The duration of free running and coasting is more in main line service because the distance between consecutive stations is significantly larger compared to suburban or urban services.
Always remember: For longer inter-station distances, the 'Coasting' and 'Free Running' periods represent a higher percentage of total journey time to optimize energy efficiency.