Commuter is the brand name given to the suburban rail services operated by Iarnród Éireann in Ireland. These operate in and around the suburban rail networks of Dublin, Cork, Limerick and Galway, in contrast to the majority of services which are classed as InterCity. In recent years, Iarnród Éireann has put a significant amount of effort into upgrading its network, with new tracks, signalling, station upgrades and trains. The majority of Commuter services are operated by diesel multiple unit train sets.
An exception to this is the DART service - this shares the line with several other services. It is the only electrified heavy rail service in Ireland.
The brand was introduced in 1994 as 'Arrow', the first specific branding for diesel suburban services, with the launch of the Arrow brand on the newly opened Kildare line. This brand was applied to stations on the line, as well as the 2600 Class railcars. It was also applied to the 2700 Class and 2800 Class railcars upon their introduction (however in the case of the latter, it was removed shortly after their introduction into service and replaced with the National Development Plan logo). Thus the Arrow brand became the first major branding for suburban railway services in Dublin (officially, its use remained limited to the Kildare line, but Arrow branded or liveried trains were used on most suburban services).
In 2003, the Arrow brand was renamed 'Commuter', upon the introduction of the 29000 Class railcars and has since been extended to the entire suburban railcar fleet. It is also used in some signage and advertising, giving the diesel commuter networks a consistent look for the first time. The Dublin railway system is now called "DART/Commuter" in line with the new brand, with the former Arrow brand having been completely phased out by 2007.
In 2010 the 2600 Class and 2700 and 2750 Classes began to be re-liveried from Commuter to a grey and green colour scheme with no reference to the Commuter brand. Instead an irishrail.ie logo referencing the then booking website was displayed on the side of the trains. In 2012 the 2800 Class was re-branded leaving the only the 29000 Class in the Commuter livery. From the start of 2013 the new bilingual logo is being introduced across the company's rolling stock, including the Commuter service. This is designed to eliminate customer confusion between the two names Iarnród Éireann and Irish Rail and create a more unified image.