Electric Traction
The resistance encountered by a train in motion is on account of

Resistance offered by air
Friction at various parts of the rolling stock
All of the listed here
Friction at the track

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

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

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