Electric Traction
The rate of acceleration on sub-urban or urban services is restricted by the consideration of

Track size
Track curves
Passenger Discomfort
Engine power

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Electric Traction
Coefficient of adhesion is

High in case of D.C. traction than in the case of AC. traction
All of the listed here
Low in case of D.C. traction than in the case of AC. traction
Equal in both AC. and D.C. traction

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