a grey undercoat before returning to Inchicore to be repainted by volunteers into a new allover blue livery with a yellow stripe below the window. A yellow box stripe and the RPSI crest on the side were also added. While this was progressing, all RPSI Cravens had the letters "RPSI" in white applied to the doors on both sides to identify them in both Inchicore and on the rail network. Two more Cravens received the allover blue treatment before Iarnród Éireann took over the repainting of the carriages in 2014. Today, all the Cravens except for 1539 have been outshopped in a new RPSI livery of blue and cream, complete with two RPSI crests on the side of each carriage. It can be noted that snack bar carriage No. 1508 is the only carriage in the set that has been repainted into the new colour scheme by the RPSI Dublin carriage crew, as she was being extensively rebuilt and repaired by the team, who wanted to do the full job themselves. Mark 2 (1972–2008) Mark 2D In 1972 CIÉ placed an order with British Rail Engineering Limited (BREL) for 72 new coaches based on the British Rail Mark 2d design. These were built at Derby Litchurch Lane Works. 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 6 First Class coaches (5101 to 5106), 9 Composites (5151–5159), 36 Standard Class (5201–5236), 11 Restaurant / Buffet / Standard Class (5401–5411) and 11 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 made extensive use of wood veneer panelling. Their electrical system also differed from the BR and NIR versions. The Generator Van contained two engine / generator sets, each supplying 220 / 380 Volts 50 Hz AC to two separate "busses" in the train. The air conditioning loads were divided in half, each half fed from each "bus". In the case of failure of one generator set, the other set automatically supplies both "busses". Air conditioning output power would then be halved, but all other loads including Cooking, Lighting and Battery Charging continue to be supplied. This has remained the model for the electrical power supply on all subsequent IE coaches. To accommodate changes in traffic, five