From Myth Busters...
Urinating on the electric third rail of a train track can cause electrocution.
busted
Although it is possible to electrocute yourself by urinating on a third rail, you would have to stand unrealistically close to the rail to do it. In most instances, a urine stream would break into droplets before making contact with the rail.
(This concept was tested with an electric fence in episode 14 and that version of the myth was confirmed. Distance is the key.)
I watched the 4-min clip; hilarious. I remember one of our scoutmasters in the 50s, tell us not to pee on a electric fence, so I never did. Whizzing on a charged rail never even occurred to me. Heh.
The article says the guy fell on the rail. The urine was incidental.
I have pissed on an electric fence when I was young teenager and it will most definitely shock you.