Learning something new

I've been around awhile, but I just discovered that electricity is apparently corrosive! That's what caught my eye in this Houston Chronicle story, "MetroRail still leaking electricity".

Electricity from power stations along the route is supposed to flow through the overhead traction wire to the train motor, then into one of the rails and back to the power station.

If rails, bridges or switches are not well insulated, power will leak into the ground and can damage metal objects such as pipes and structural steel near the rails, although such damage is generally quite slow.

I did not know that. Did you?