Provided you saw the sparrow split its leg to touch both the
track.
As long ddon't touch both the track won't get shock. + and - =
close circuit.
There was once I drive a pick up speeding at 110KM/Hr, suddenly I
saw a wheel speeding faster than me. I was so mad and shift to the
fifth grear, out of a suddenly I saw my pick up smokes and caught
fire.
Then I realise the wheel was from my pick up and my pick up does
not have fifth gear 
