Electric Traction
Quadrilateral speed-time curve pertains to which of the following services?

Main line service
Urban service
Suburban service
Urban and suburban service

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

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