There are a number of modes of public transport in the Greater Dublin area run by a number of transport operators, most of them state or quasi-state entities.
Public transport in Dublin was overseen by the Dublin Transportation Office until 2009 when the National Transport Authority replaced this body.
Public transport in Dublin has undergone expansion in recent years, and the Irish Government had plans to invest heavily in the system under the Transport 21 plan. However, as a result of the changed economic environment since 2008 these plans have been subject to re-assessment.
Dublin's transit system currently utilises electrified suburban trains, diesel commuter rail, trams and an extensive bus network to provide service to the population of the Greater Dublin Area.
The Railway Procurement Agency was responsible for establishing an integrated ticketing system for use throughout Dublin City. This system was introduced on 12 December 2011 and is based on use of a pre-paid electronic card called a Leap card.
The National Transport Authority is responsible for improving integration between Dublin's various public transport systems. The number of Leap card users was reported to have increased by 250,000 users to 1 million users in April 2015.