Yes there are statistics. The system all mainline Railway Undertakings report into (SMIS) is managed by RSSB, here's a link to the publicly accessible RSSB SMIS front page https://www.rssb.co.uk/safety-and-h...ligence/safety-management-intelligence-system. So yes, the TOC can and almost certainly does have a good understanding of the risk for each station they manage.
There is also quite a sophisticated understanding in the industry of the sort of characteristics that attract people in such a state of mind. The Samaritans works with the rail sector on this issue and (I am told by someone who was trained by them) their experience is that small interventions such as someone asking "Can I help you?" or seeing a sign offering help may be enough to bring someone in that state of mind back from the brink- apparently the state of mind doesn't always last that long. Having the confidence to engage can be life-saving.
TPO
This is also how decisions such as where to invest in suicide fences are taken. The data isn’t widely publicised because knowledge of hotspots can produce copycat attempts, as has been statistically proven.
I'd be interested to know what training they are given and the red flags to look out for. Also, are they paid or volunteers?
Very much a paid role.