I agree we need more details on this one. A Guard would have issued some form of paperwork if it was a UFN, same as if it was a PF.
Amy, if you genuinely had no knowledge of proceedings, you need to start making some phone calls and find out what's going on. Bearing in mind you have NO knowledge of any proceedings, I'd first contact the train company concerned to see what happened, as I'm assuming you're unaware which court heard the case? If you know which court it was, you need to go to them and ask to fill out a Statutory Declaration. This will re-open the case and is intended for such situations whereby a defendant is unaware of a case going to court.
It's strange for a case to get this far without the defendant knowing anything about it. You should check with the court that they have your correct details too, because as you've only heard from this from a news paper, I'm assuming you've not had the official outcome from the court and thus could also be in arrears there too.
Bit of a stab in the dark, but how common is your name (I'm assuming you're not an Amy as the article mentions a man....Unless you really are mistaken

), and could you be confused with what you've read and are panicking unnecessarily?