'Unexplained' will not include the possibility of foul play. It's used to cover 'death by misadventure', 'accidental death' and 'suicide'. The police would, in all likelihood, say if they are treating the death as suspicious and beginning a murder enquiry.
There are well over a dozen different verdicts that can come from a coroner's court ... and (when you think about it) a whole lot of reasons that someone can end up as "person hit by train".
(S)he tripped and fell
(S)he was pushed intentionally
(S)he was pushed unintentionally
(S)he was helping couple up railway vehicles when one of them moved
(S)he misjudged it on a passenger walkway over the track
(S)he was escaping from 'the law' over the railway line
(S)he fainted, falling in front of the train
(S)he keeled over and died, falling in front of the train
(S)he jumped onto the track to rescue someone who had fallen but got hit him/herself
(S)he jumped intentionally
(S)he jumped intentionally because (s)he was terminally (but slowly) ill and in great pain
Not my field ... but I have learned on this forum that things might not always be as they seem - an enquiry by email from a friend as to "was it painless" may actually be an enquiry by someone involved to try and find out how much the authorities know. There are many, many alternatives such as those listed above to consider. And I've also learned that there are - almost inevitably - friends and family who will be naturally distressed and deserve the utmost sympathy.
P.S. My comment about someone involved fishing for information relates to real case(s), but NOT to my knowledge to anything that remains open such as yesterday's events.