Electric Traction
In case of locomotives the tractive power is provided by

Single stage steam turbine
Single cylinder double acting steam engine
Double cylinder, single acting steam engine
Double cylinder, double acting steam engine

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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
Interference with communication lines
Short time power failure interrupts traffic for hours
Corrosion problems in the underground pipe work

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