Electric Traction
For which of the following locomotives the maintenance requirements are the least?

All of the listed here
Electric locomotives
Diesel locomotives
Steam locomotives

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

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

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