London Underground retired the last of its D78 trains, dating from the late-1970s and early-1980s, in late-April. They have been replaced by Bombardier-built S7 units on the District Line, completing the seven-year, wholesale replacement of the LU sub-surface line’s fleet. The last D78 formation in regular service was formed of half-sets Nos. 7032 and 7007,…
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