Answer / naresh

it is completed through therails to ground through the
wheels

Answer / jagadisha.n bmsit

Obviously there should be neutral connection to flow of
current. Positive is connected from overhead line and
neutral connection is from track through wheels..

Answer / sreenadh

actually the top most line is the power line.the second
line is also power line.the connecting wires between the
two lines are called droppers.droppers give power from top
line to the second line.the negative comes from the
trails.at equi distant points they are earthed by iron rods.

Answer / sreenivas koramutla

There are two line called Catenary wire and Contact wire.
Both are power lines. we feed voltage to catenary and Pento
of Engine is in contact with Contact wire. In between lines
there are Dropper wires. This is Phase and Neutral connects
from Track. This is Single phase supply

Answer / roushan.eee

it takes negative from the track.

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