 Some parts of Stonebridge have always been in private ownership, and not been part of the Stonebridge Estate.Although Stonebridge is geographically adjacent to the Park Royal industrial estate, it is almost entirely cut off from it because of the Bakerloo/Watford DC/West Coast Main Line railway tracks and a large Royal Mail distribution centre.During the 1950s the council planned a massive redevelopment covering almost 100 acres of Stonebridge.