So what went wrong?
DEADLINES for rolling out integrated ticketing were missed in 2002, 2005, 2006 and 2009.
And right up to its eventual launch in December the Leap card was plagued with technical hitches.
Fortnightly progress updates given to Transport Minister Leo Varadkar show plans to launch it last summer were scuppered by software bugs on Dublin Bus as well as difficulties between Irish Rail and a German supplier.
Hewlett Packard was then unable to complete "disaster recovery tests".
The software giant was forced to employ outside experts to resolve the issue by October, though the NTA noted this was at their own cost.
Further problems arose with Irish Rail's back office system, and there were additional software bugs throughout the autumn.
After numerous launch dates were pushed back, the system finally got up and running on December 12, although numerous important features like automatic top-ups by direct debit are still being worked on.
The Comptroller and Auditor General previously highlighted the inter-agency wrangling and wasted expense on the system that contributed to delays.