If so, in addition to what others have said about it being almost certainly irrelevant, job title won't mean much given you have paid, for virtually everyone job title will not be attached to an individual employer.
I wouldn't count on that. My role, outside the railway, has a unique title and would absolutely be identifying as to who my employer is with a simple internet search. Having said that I agree that it is effectively meaningless to the TOC asking for payment, they aren't going to contact your employer.
As others have said you don't have to give the TOC your job title in any correspondence. They are offering a settlement before taking legal action so you don't have to respond at all but if you do wish to pay the offered settlement some kind of response is required. Personally I doubt the lack of a job title on the form will result in the payment not being accepted to close the matter.
The only potential issue here is if the opening poster is accused of committing a dishonesty offence in a role where such things have professional registration requirements to self report. I'm guessing if they are in such a role you will know your professional bodies rules around such things.