Old railroads are all the rage when it comes to adaptive reuse. New York City kicked off the trend with its High Line park, which officially opened to the public last year. Now we’ve got Chicago’s long-anticipated rails-to-trails park system, the Bloomingdale Trail, set for completion in 2014, with plans for a smaller-scale but similar project being kicked around in Milwaukee. In London, city officials are contemplating the creation of a mushroom farm in the old, unused railroad tunnels beneath the city — and in Philly, officials are considering a subterranean addition to Reading Viaduct park, which will transform a stretch of the old Reading Railroad line into a pedestrian-friendly park and trail.

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