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

Engine power
Track size
Passenger Discomfort
Track curves

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Electric Traction
Coefficient of adhesion is

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

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