Electric Traction
The specific energy consumption of a train depends on which of the following?

All of the listed here
Gradient
Acceleration and retardation
Distance covered

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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
Interference with communication lines
Short time power failure interrupts traffic for hours
High capital outlay in fixed installations beside route limitation

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