The knee jerk advice to any prosecution thread is to write a nice letter to the Train Operating Company concerned. In this case, what the OP needs to do is accept they're going to court and seek advice from a solicitor with regards to mitigating the severity of the punishment.
Well, I've heard that even somebody who made their own Blue Peter season ticket managed to settle out of Court, so it can be done, but that's down to the TOC concerned. It may well be that if they have an overwhelming amount of evidence of fraud, they'll decide it should be dealt with in Court as you describe. I don't see that there's anything to lose by attempting to settle out of Court, but don't be entirely surprised if the offer is rebuffed.