Yes, there are. TOCs can sometimes exercise discretion and choose not to prosecute or threaten to prosecute you. However, given that your offence involves the misuse of a JobCentre railcard, which is considered very serious, I would be somewhat surprised if they exercised this discretion.
Have you checked all of your correspondence (physical, email, incl. spam) over the past seven months closely and ensured that you have received no correspondence at all from them?
Alternatively, they may just have forgotten about you. I think it is possible (wait for other forum members’ comments on this before you act on it) that it will be wise to contact Chiltern and check they haven’t convicted you in absentia, since they are now out of time to prosecute you anyways so there’s no danger of reminding them to do so. I am not entirely sure on this and if they do choose to try anyways it may result in further trouble and paperwork.
If you find out in the future (for example via a fine suddenly being deducted from your salary, or a bailiff showing up at your door - has happened before!) that you have in fact be convicted in absentia, you are able to file a statutory declaration at a local solicitor’s office, informing the court you were unaware of the case and hence in effect resetting the clock on the case. You can then contact Chiltern and try to hack out an out of court settlement while you wait for the court case to proceed again.