The success of the London Overground just goes on and on – so much that trains will be expanded to five carriages by the end of 2015.
It's only a couple of years since capacity expanded from three cars to four, but the network has grown to include the old East London Line, its extension to Crystal Palace and the recent link-up to Clapham Junction. The network also has consistently better passenger satisfaction levels than other metro train companies. No wonder it's carrying four times the number of people than it did at launch in 2007, and that's before they factor in new passengers using it from Clapham.
Platform extension work will be necessary on some stations on the old East and North London lines, but now you know what it's for.