Südgelände Nature Park, Berlin -- Rewilding

 * railway operations fostered the abundance -- plants and insects from the surrounding countryside followed 
   the corridors
 * seeds and smaller animal life came as “stowaways” on trains from other regions
 * over the four decades of dereliction, plants colonized cuts, embankments, viaducts and ramps of the yard
 * resulted in a mosaic of habitat types - dry grasslands, tall herbs, shrub vegetation and damp woodlands

Photo (http://berlin.unlike.net/locations/414-Suedgelaende)