Electric Traction
Which of the following braking systems on the locomotives is costly?

Regenerative braking on electric locomotives
Vacuum braking on diesel locomotives
All braking systems are equally costly
Vacuum braking on steam locomotives

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Electric Traction
Locomotive having mono-motor bogies

Has better coefficient of adhesion
Has better riding qualities due to the reduction of lateral forces
All of the listed here
Are suited both for passenger as well as freight service

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