The overground rail network, which virtually seized up after the Hatfield crash six years ago, is now carrying many more passengers—but on grievously overcrowded trains in and around London.

地上铁路网络在六年前 的哈特菲尔德事故之后逐渐老化，现今却承载着更 多 的 旅客和严重超载 的火车穿梭于伦敦内外。

youdao

The order, for 57 carriages, will allow TfL to operate longer trains and increase passenger capacity on the London Overground network.

BBC: Bombardier awarded ?88m Transport for London contract

And all of it is served by a vast network of coaches and trains, including underground, overground and lightrail.

BBC: Living in: Great cities for public transport