Electric Traction
Tractive effort is required to

Accelerate the train mass
Overcome friction, windage and curve resistance
Overcome the gravity component of train mass
All of the listed here

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Electric Traction
Which of the following is the disadvantage of electric traction over other systems of traction?

Corrosion problems in the underground pipe work
Short time power failure interrupts traffic for hours
Interference with communication lines
High capital outlay in fixed installations beside route limitation

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