s ▁for ▁operation ▁on ▁E ust on ▁to ▁Wat ford ▁J unction ▁services . ▁Both ▁S out he astern ▁and ▁London ▁Over ground ▁have ▁with dra wn ▁their ▁fle ets ▁for ▁replacement ▁- ▁S out he astern ▁has ▁been ▁able ▁to ▁cas cade ▁existing ▁rolling ▁stock ▁to ▁the ▁She ern ess ▁and ▁Med way ▁lines , ▁while ▁the ▁London ▁Bridge ▁to ▁Ton bridge ▁via ▁Red hill ▁service ▁has ▁been ▁transferred ▁to ▁Southern ; ▁London ▁Over ground ▁has ▁fully ▁introduced ▁its ▁new ▁Class ▁ 3 7 8 ▁units . ▁▁▁ 5 0 8 / 2 ▁units ▁ 5 0 8 2 0 1 - 5 0 8 2 0 6 , ▁ 5 0 8 2 0 9 , ▁ 5 0 8 2 1 1 ▁and ▁ 5 0 8 2 1 2 ▁as ▁well ▁as ▁parts ▁of ▁ 5 0 8 2 0 7 , ▁ 5 0 8 2 0 8 ▁and ▁ 5 0 8 2 1 0 ▁were ▁scra pped ▁at ▁East le igh ▁in ▁ 2 0 1 3 . ▁▁▁ 5 0 8 / 2 ▁B D MS O ▁carri ages ▁ 6 4 7 1 0 ▁( 5 0 8 2 0 8 ) ▁and ▁ 6 4 7 2 0 ▁( 5 0 8 2 1 0 ) ▁surv ive . ▁▁ 5 0 8 / 2 ▁D MS O ▁carri ages ▁ 6 4 6 4 9 ▁( 5 0 8 2 0 1 ) ▁and ▁ 6 4 7 1 2 ▁( 5