▁number ed ▁ 5 0 8 0 0 1 – 5 0 8 0 4 3 . ▁When ▁they ▁transferred ▁to ▁Mer se ys ide ▁they ▁were ▁ren umber ed ▁ 5 0 8 1 0 1 – 5 0 8 1 4 3 ▁and ▁designated ▁as ▁Class ▁ 5 0 8 / 1 ▁to ▁avoid ▁confusion ▁with ▁the ▁similarly ▁number ed ▁Class ▁ 5 0 7 s . ▁The ▁Mer sey ra il ▁ 5 0 8 s ▁were ▁ref urb ished ▁in ▁ 2 0 0 3 / 0 4 . ▁The ▁first ▁unit ▁to ▁re - enter ▁service ▁was ▁ 5 0 8 1 1 0 . ▁The ▁final ▁unit ▁to ▁leave ▁for ▁the ▁works ▁for ▁ref urb ishment ▁was ▁formerly ▁black - strip ed ▁ 5 0 8 1 3 7 . ▁S out he astern ▁units ▁were ▁ren umber ed ▁ 5 0 8 / 2 ▁when ▁ref urb ished ▁in ▁ 1 9 9 6 . ▁ 5 0 8 2 0 3 , ▁ 2 0 5 , ▁ 2 0 7 , ▁ 2 0 8 , ▁ 2 1 0 ▁and ▁ 2 1 1 ▁were ▁further ▁over h au led ▁at ▁W ab te c , ▁Don c aster ▁in ▁ 2 0 0 7 . ▁Silver link ▁units ▁were ▁ren umber ed ▁ 5 0 8 / 3 ▁when ▁they ▁were ▁ref urb ished ▁in ▁ 2 0 0 3 , ▁modified ▁to ▁make ▁them ▁compatible ▁with ▁Class ▁ 3 1 3