I am new to this forum and am rather surprised to see no mention of this incident last month.
I was on the 08.09 from Pewsey (05.35 from Plymouth) when it suddenly ground to a halt just after Taplow. An automated annoucement said "Will the train manager please contact the driver immediately". A couple of minutes later, the train manager announced that the train had hit someone. We were then delayed by 2hr 50mins.
Subsequently I found out that the person who sadly decided to take their life in this way was a city financier called Kirk Stephenson who worked for a private equity company - Do a google search on the name for more info.