I beg to differ.
If people want to do it, they'll go to the extreme. Even if it
takes of them to climb over the HHPSDs. You never know.
Installing HHPSDs only help to prevent further suicides from
happening, but it doesn't 100% guarantee that there won't be
suicide cases.
But most of the time, it wont be that easy. Especially for the
females (There are female suiciders via tracks as well, both
locally and internationally). So, by the time they have climb the
HHPSD, the train had already stopped such that they cant jump into
the tracks.
If they climb early, like 2 mins before the train arrive, it
should have enough time to brake the train instead.