If a rail safety worker who is found guilty or convicted of an offence against any one of the paragraphs of section 76(1) or against that section has at any time been found guilty or convicted of—
(a) an offence against the same or any other of those paragraphs or against that section; or
(b) an offence against any corresponding law—
the finding of guilt, or conviction, of the offence against that paragraph or section is to be taken to be a conviction for a subsequent offence.