It's always quite fun to listen in to people's mobile phone conversations whn you're on a train delayed due to this.

First thing that happens is the train stops. Tends to sit there for maybe ten or fifteen minutes before the guard gets on the PA: "Due to a passenger in front of a train at Clapham Junction (or whereever), we'll be delayed while the line is cleared".

This cues the first lot of mobile phone calls, if it's on the way home "I'm on the train, will be a bit late, someone's jumped in front of the train" or something like that.

After about another half an hour, most people tend to send a text or something like that.

If the train still hasn't moved after an hour, the phone conversations are a little more like this, "Some stpuid bugger's just gone and kiled themselves by jumping in front of the train in front" or "we're still waiting for them to scrape that twat off the train in front - bloody thoughtless of them to do it in the rush hour!" and variations on that.

My mum actually saw someone jump in front of a victoria line train at King's Cross about 30 years ago. Still scares her.