I think in general the policy of prosecuting authority (Tfl etc etc) for a first offender (also under breaches of Regulations of Railways Act 1889 section 5.3.a that is the most common...)i that summons are issued without ASN. First offence should be non imprisonable. I have seen this in a police forum : "You will often have a choice between specific legislation relating to the form of transport, and proceedings under the Theft Act 1978, or Forgery and Counterfeiting Act 1981. Section 5 Regulation of Railways Act 1889 is usually used for offences of fare evasion on the railways for: Both Section 5 and Section 103(a) are summary only offences. "Intent to avoid payment" in Section 5 does not mean a dishonest intent, but an intent to avoid payment of the sum actually due. There are provisions in bye-laws which cover fare evasion, but in the vast majority of cases it will be appropriate to use the Section 5 offence. Consider using the provisions of the Theft Act 1978, especially Sections 2 and 3, where there is evidence of premeditation, or persistence, or repeat offending, or large loss by the transport authority. Where tickets have been altered or defaced consider a charge under the Forgery and Counterfeiting Act 1981."

I think , but not sure , that if the police create the arrest number ..ASN .. theconviction enter in the PNC ..otherwise is just a court record ...