rail. Republic of Ireland In 1972 CIÉ placed an order with BREL for 72 coaches based on the Mark 2D. With air conditioning as a principal feature they became known as "AC Stock" and ran on type B4 bogies, with vacuum brakes. The order consisted of six First Class coaches (5101–5106), nine Composites (5151–5159), 36 Standard Class (5201–5236), eleven Restaurant/Buffet Standard Class (5401–5411) and eleven Generator Vans (5601–5611). Internal fit-out was done in Inchicore, and was quite different from the original BR design, using bench seating rather than individual seats and with extensive use of wood veneer panelling. Their electrical system differed from the BR and NIR versions. The generator van contained two engine/generator sets, each supplying 220/380 V 50 Hz AC to two separate electrical buses in the train. The air conditioning loads were divided in half, each half fed from a separate bus. In the case of failure of one generator set, the other set automatically supplies both buses. Air conditioning output power would then be halved, but all other loads including cooking, lighting and battery charging would continue to be supplied. This later remained the model for the electrical power supply on all subsequent IE coaches. To accommodate changes in traffic, five of the Composites (5153–5156, 5158) were re-classed as Standards, and Restaurant/Buffet Standard 5408 was converted for use as the Presidential Coach. Iarnród Éireann purchased fifteen carriages from a UK scrap dealer during 1989, in exchange for a similar number of scrap diesel locomotives. Older Mark 2A/B/C carriages were scrapped in 2004, as they were heavily corroded. A few were preserved (minus bogies) at certain heritage railways in Ireland. The remaining Mark 2 carriages (the 1972 vintage Mark 2D sets) were phased out during 2007 and 2008, with the last set operating its final service, the 0505 Athlone–Heuston, on 31 March 2008. Two of these coaches, 5106 and 5203, were preserved by the Railway Preservation Society of Ireland. The Presidential Coach, 5408, has also been preserved by the RPSI. New Zealand 150 refurbished former Mark 2D, 2E, and 2F First Open and Tourist Standard Open carriages are operated on New Zealand railway lines. The first 16 were exported in January 1997. Although New Zealand railway lines have a narrower track gauge of , the country has a similar loading gauge, allowing regauged BR carriages to run on most lines. The first carriages were imported in 1996