The derelict rail bridge stretches across a busy north London street, green foliage peeking out of the gaps between the beams overhead, where bright blue paint flakes from rusting steel.

Farther east, the railway’s grand Victorian-era arches span a small slice of park wedged between two streets, where tents belonging to homeless people, a discarded mattress and broken bottles are scattered about.

While the elevated train line and some of the areas it cuts through may look neglected now, if all goes according to plan, it will become the site of the Camden High Line, a planned public park that aims to turn this disused stretch of the city into a thriving green space.

“They’re all unloved bits of Camden,” said Simon Pitkeathley, the chief executive of Camden Town Unlimited, the business improvement district behind the initiative, of the areas that will one day provide the ground-level entrances to the High Line.

Strolling along the route of the planned park, which will sit some 25 feet above the streets, allows for a different view of London. Up here, the air feels fresher and the bustle below fades away as the view stretches over a patch of north London peppered with homes and office buildings.