From A Landscape Manifesto:
"Converting a railroad corridor to a linear park results in an essential transformation of a past artifact. Though linear parks and other new landscape forms take their structure from the past, they have risen to the level of new typologies. They mark the beginning of a new landscape agenda. The example of an abandoned railway line made into a linear park or greenway will serve as the poster child of such ecological transformations."
More at The Awl.