Electric Traction
Long distance railways use which of the following?

25 kV two phase A.C.
25 kV three phase A.C.
25 kV single phase A.C.
200 V D.C.

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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
High capital outlay in fixed installations beside route limitation
Corrosion problems in the underground pipe work

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