Here is an ancient suicide, probably from around 1876. I think the
real location may have been Willesden Jct:

"...Tenway Junction is so big a place, and so scattered, that it is
impossible that all the pundits should by any combined activity
maintain to the letter the order of which our special pundit had
spoken. Lopez, departing from the platform which he had hitherto
occupied, was soon to be seen on another, walking up and down, and
again waiting. But the old pundit had his eye on him, and had followed
him round. At that moment there came a shriek louder than all the
other shrieks, and the morning express down from Euston to Inverness
was seen coming round the curve at a thousand miles an hour. Lopez
turned round and looked at it, and again walked towards the edge of
the platform but now it was not exactly the edge that he neared, but a
descent to a pathway, --an inclined plane leading down to the level of
the rails, and made there for certain purposes of traffic. As he did
so the pundit called to him, and then made a rush at him,--for our
friend's back was turned to the coming train. But Lopez heeded not the
call, and the rush was too late. With quick, but still with gentle and
apparently unhurried steps, he walked down before the flying engine--
and in a moment had been knocked into bloody atoms."

That is from The Pallisers by Anthony Trollope