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The fleet was initially formed as five 7-car sets (AO1–5) and three 5-car sets (AO6–8), with the three 5-car sets having different coloured front ends: silver for AO6, yellow for A07, and dark blue for AO8.[3] The 5-car sets were lengthened to 7 cars from July 2008 with the insertion of two -1000 subseries cars with aluminium bodies built to 885 series specifications.[4]
