Electric Traction
Automatic signalling is used for which of the following trains ?

Mail and express trains
Superfast trains
Suburban and Urban electric trains
All of the listed here

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Electric Traction
Coefficient of adhesion is

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
Equal in both AC. and D.C. traction
All of the listed here

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