Until 2015, the former British Rail carriages ran virtually all carriage regional commuter services. Most of them (104) operated in Auckland, classified SA (81) and SD (23), in push-pull commuter trains, with three to five SA carriages, a SD driving carriage (similar to the original Mark 2 DBSOs), and a DC class (four- and five-car) or DFT class (six-car) diesel-electric locomotive. Auckland has since replaced its entire suburban fleet with the purpose-built New Zealand AM class electric multiple unit. Other BR Mark 2 carriages operate on the Capital Connection (8× S class), and the Wairarapa Connection between Masterton and Wellington (18× SW class). There are also six SE class carriages, which were used with electric locomotives on Wellington commuter services between 2008 and 2011 as a temporary measure until new EMUs were delivered. The carriages were reassigned to the Wairarapa Connection in June 2013, where peak service patronage was starting to exceed the capacity of the SW carriage fleet. Mainline Steam also own four refurbished carriages, classified ML, which are based in Plimmerton (north of Wellington) and are used for its steam-hauled excursions.