From the editor

摘要

Here's an idea for mayors all over the world: if you discover an abandoned railway in the centre of your city, whose transport infrastructure is already straining, don't transform it into an urban strip farm or High Line-style hipster park. No, no no - try this instead: revive its fortunes by rebuilding ... a railway. But this really is the situation facing Paris and its mayor, Anne Hidalgo. She wants to regenerate the Petite Ceinture ('little belt'), an abandoned railway built more than 150 years ago in the city centre, into a cultural hub with cinemas and aquariums.