Electric Traction
An ideal traction system should have

Easy speed control
All of the listed here
Equipment capable of withstanding large temporary loads
High starting tractive effort

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Electric Traction
Coefficient of adhesion is

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

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