Stephen Furley writes
The live rail is always furthest from the platform. It would have to be
a spectacular fall in order to land on the live rail.

Usually, but not always. Where there is a platform on both sides of
the track one of them has to be on the same side as the conductor rail.

And in the few places where this is the case, you'll usually find the
live rail is protected with wooden boards.

--
Dave