Electric Traction
Automatic signalling is used for which of the following trains ?

Suburban and Urban electric trains
Superfast trains
All of the listed here
Mail and express trains

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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
Corrosion problems in the underground pipe work
High capital outlay in fixed installations beside route limitation
Interference with communication lines

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