No that's wrong.
A Disclosure Scotland Check (a Basic CRB) will disclose all unspent Convictions (not cautions).
A Standard CRB will disclose all spent and unspent convictions plus cautions, warnings & reprimands.
An Enhanced CRB will disclose all spent and unspent convictions plus cautions, warnings & reprimands PLUS will check the "barred" lists plus in rare situations relevant information held by the Police but where there was no conviction.
The type of check an employer does will depend on the nature of the job although many employers do Standard or Enhanced CRBs where there is no legal authority to do them.
Byelaw offences are not Criminal Offences and will not show up on any CRB type check.
.
I asked a magistrate this question in September this year, relating to local council Byelaws, not Railway ones.
The Magistrate confirmed that most Byelaw offences result in a record of conviction which could be made visible, to people requiring enhanced disclosures within industry.
My lecturer did not mark me down or make any specific comment when this went into my course work.
My local company, Merseyrail has this on their site:
merseyrail.org said:
Q:Will I get a criminal record?
A: If found guilty of a Byelaw offence, it may appear on an enhanced CRB CHECK but if you are found guilty of a Railway regulation act 1889 section 5 offence, then this would show up on any CRB CHECK. If you pay the administrative penalty, this will enable us to withdraw your case from court, and consequently you will have no CRB RECORD.
Westminster Council also think the same, in relation to Local Authority Byelaws:
http://transact.westminster.gov.uk/CSU/General_Purposes_Urgency/2012/19%20January%202012/11%20-%20Annex%20E%20-%20Crisis%20response.pdf said:
We are concerned that under byelaw 8 a rough sleeper could find themselves with a fine of up to £500 that they are unlikely to be able to pay and a criminal record that could put further barriers in the way of them breaking out of homelessness.
Basingstoke Council also believe Breach of Byelaws is a criminal offence:
http://www.basingstoke.gov.uk/browse/advice-and-benefits/legal-advice/byelaws.htm said:
The Council may apply to the Secretary of State for permission to operate bye laws covering particular activities. These are effectively local laws to deal with local issues.
Failure to comply with bye laws is a criminal offence. In many cases any person contravening a bye law is liable on summary conviction to a fine
Also, I meant delegated legislation, (not secondary).
Employers now tend to word their questions differently now anyway, such as:
"Have you ever been
investigated or
involved in relation to any offences, whether or not it resulted in a conviction?"