Irish Rail has said it is developing ways to clamp down on abuse of the free travel pass system.
It follows reports in today's Irish Daily Mail that 20 passes a day are confiscated from people who are not entitled to one.
There are also claims that abuse of the system is costing the taxpayer €61m a year.
Irish Rail spokesperson Barry Kenny queries the Daily Mail's figures but admits abuse of the travel pass system is a problem.
"There's a small number of cases where people are doing it on an on-going basis," he said, saying there were more than 100 cases last year where Irish Rail recovered more than €80,000.