Electric Traction
The steam engine provided on steam locomotives is

Single acting non-condensing type
Single acting condensing type
Double acting non-condensing type
Double acting condensing type

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Electric Traction
Coefficient of adhesion is

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