Despite the increasing age and obsolescence of the Class 80, the lack of available rolling stock meant that NIR was forced to retain a number of units, even in spite of the entry into service of the new Class 3000.
Until 2011, NIR maintained up to three 4-car units for use on passenger services.
These saw a pair of 2-car units, a power car and driving trailer, coupled back to back.
Six trailers were refurbished and fitted with central door locking enabling them to remain in service until the new Class 4000 units entered service in 2012. (
742 had been nominated for retention but was scrapped in May 2008 and replaced in the programme by 752)
The power cars were overhauled at LH services in Staffordshire and the trailers at York Road works in Belfast
Set 89-733-738-69  remained in service until 24 May 2008
Set 93-754-749-94 was sporadically on test from Wednesday 23 July 2008.
From Monday 3 November 2008, regular passenger services commenced with this set.

On Thursday 17 December 2009, a second refurbished 80 class was deployed onto the Larne Line.
The final sets on the Larne Line were 90-749-752-93 and 94-754-747-82.
The third refurbished set was stored at York Road and it consisted of 69-733-738-89.
It was rumoured that 82 had been withdrawn from service following from an engine fire.
82 was fixed and returned to working order after the fire in Larne.

On Tuesday 26 January 2010, 89 entered passenger service with 93, 90 was taken off the set on 23 January 2010.
90 was stored at the south end of the south siding at York Road.
Despite the increasing age and obsolescence of the Class 80, the lack of available rolling stock meant that NIR was forced to retain a number of units, even in spite of the entry into service of the new Class 3000. Until 2011, NIR maintained up to three 4-car units for use on passenger services. These saw a pair of 2-car units, a power car and driving trailer, coupled back to back. Six trailers were refurbished and fitted with central door locking enabling them to remain in service until the new Class 4000 units entered service in 2012. (742 had been nominated for retention but was scrapped in May 2008 and replaced in the programme by 752)
The power cars were overhauled at LH services in Staffordshire and the trailers at York Road works in Belfast
Set 89-733-738-69  remained in service until 24 May 2008
Set 93-754-749-94 was sporadically on test from Wednesday 23 July 2008. From Monday 3 November 2008, regular passenger services commenced with this set.
On Thursday 17 December 2009, a second refurbished 80 class was deployed onto the Larne Line. The final sets on the Larne Line were 90-749-752-93 and 94-754-747-82. The third refurbished set was stored at York Road and it consisted of 69-733-738-89. It was rumoured that 82 had been withdrawn from service following from an engine fire. 82 was fixed and returned to working order after the fire in Larne.
On Tuesday 26 January 2010, 89 entered passenger service with 93, 90 was taken off the set on 23 January 2010. 90 was stored at the south end of the south siding at York Road.
NIR Class 80