A new fleet of Southern Railways trains made by Derby-based trainmaker Bombardier have made their debut in London, in the presence of the Transport Secretary.
Patrick McLoughlin saw the trains being tested first-hand at the depot in Battersea.
Bombardier signed a deal worth a £188 million to make around 130 carriages.
The fleet will be rolled out on the capital's busiest commuter routes from December.
Des McKeon, Commercial Director of Bombardier UK said:
The new trains will run on London routes from 2015.