Great Western Coffee Shop

From Zagreb station ...

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Love the last one!

The one about urinating off bridges onto the power lines can certainly result in a rather unintended type of flashing!

Probably not that dangerous, though please do not try it, just in case.
Urine is unlikely to form a solid stream, but is more likely to consist of droplets with air spaces between them.
The risk is probably comparable to standing under OHLE during a thunderstorm or standing under high voltage grid lines in similar conditions.

I suspect it is a solid stream as a micro Amazonian fish can swim up the sream to enter the body.

I very much doubt that said fish can swim up a stream of urine as might result from a person peeing off a bridge or boat.
If however the person is IN the water, then it might be possible.

I have checked this and you are correct.  It swims in if you are in the water.  Tight speedos (or equivalent) are recommended to prevent it.

Here's the Mythbusters take on peeing on the third rail: https://www.dailymotion.com/video/x3pidli

The (simulated) urine in that video can be clearly seen falling in drops, with air gaps between them, and not as a solid stream.
In my youth, I observed many drunks urinating* on LUL tracks. AFAIK they all survived.
The voltage to earth is a bit less than on main line DC electrified routes but still dangerous, about 440 volts to earth on LUL rather than 750 volts to earth on network rail. Both voltages vary.
Please do not try it though, just in case.

*At Wood Green underground station, when the Great British Beer Festival was held nearby, at Alexandra  Palace, about  1978. half a lifetime ago, but I doubt that urine or electrified railways have changed much since then.