METRO ticket inspectors are issuing 5000 more fines each month than a year ago, generating millions of dollars in extra revenue as part of a major crackdown on fare evaders.

The blitz comes after an internal report obtained by The Age confirmed fare evasion is rampant, with one in 10 rail passengers found to be travelling without valid tickets last year.

The report also reveals public transport authorities have classified fare evaders into different categories, including ''game players'', to better understand their nature.

Metro ticket inspectors issued more than 53,000 fines in the first four months of the year - 20,000 more than in this period last year - with evaders now 60 per cent more likely to be caught.